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<h1 align=center>Release History</h1>

<p>
This page provides a high-level summary of changes to SQLite.
For more detail, refer the Fossil checkin logs at
<a href="http://www.sqlite.org/src/timeline">
http://www.sqlite.org/src/timeline</a> and
<a href="http://www.sqlite.org/src/timeline?t=release">
http://www.sqlite.org/src/timeline?t=release</a>
</p>

<a name="version_3_7_14"></a>
<h3>2012-09-03 (3.7.14)</h3><p><ul>
<li>Drop built-in support for OS/2. If you need to upgrade an OS/2
    application to use this or a later version of SQLite,
    then add an application-defined <a href="vfs.html">VFS</a> using the
    <a href="c3ref/vfs_find.html">sqlite3_vfs_register()</a> interface.  The code removed in this release can
    serve as a baseline for the application-defined VFS.
<li>Ensure that floating point values are preserved exactly when reconstructing
    a database from the output of the ".dump" command of the 
    <a href="sqlite.html">command-line shell</a>.
<li>Added the <a href="c3ref/close.html">sqlite3_close_v2()</a> interface.
<li>Updated the <a href="sqlite.html">command-line shell</a> so that it can be built using
    <a href="compile.html#omit_floating_point">SQLITE_OMIT_FLOATING_POINT</a> and <a href="compile.html#omit_autoinit">SQLITE_OMIT_AUTOINIT</a>.
<li>Improvements to the windows makefiles and build processes.
<li>Enhancements to <a href="pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> and <a href="pragma.html#pragma_quick_check">PRAGMA quick_check</a> so that
    they can optionally check just a single attached database install of all
    attached databases.
<li>Enhancements to <a href="wal.html">WAL mode</a> processing that ensure that at least one
    valid read-mark is available at all times, so that read-only processes
    can always read the database.
<li>Performance enhancements in the sorter used by ORDER BY and CREATE INDEX.
<li>Added the <a href="compile.html#disable_fts4_deferred">SQLITE_DISABLE_FTS4_DEFERRED</a> compile-time option.
<li>Better handling of aggregate queries where the aggregate functions are
    contained within subqueries.
<li>Enhance the query planner so that it will try to use a <a href="queryplanner.html#covidx">covering index</a>
    on queries that make use of <a href="optoverview.html#or_opt">or optimization</a>.
<li>SQLITE_SOURCE_ID: 
    "2012-09-03 15:42:36 c0d89d4a9752922f9e367362366efde4f1b06f2a"
<li>SHA1 for sqlite3.c: 5fdf596b29bb426001f28b488ff356ae14d5a5a6
</ul></p><a name="version_3_7_13"></a>
<h3>2012-06-11 (3.7.13)</h3><p><ul>
<li><a href="inmemorydb.html">In-memory databases</a> that are specified using
    <a href="uri.html">URI filenames</a> are allowed to use <a href="sharedcache.html#inmemsharedcache">shared cache</a>,
    so that the same
    in-memory database can be accessed from multiple database connections.
<li>Recognize and use the <a href="uri.html#coreqp">mode=memory</a> query parameter in
    <a href="uri.html">URI filenames</a>.
<li>Avoid resetting the schema of <a href="sharedcache.html">shared cache</a> connections when any one
    connection closes.  Instead, wait for the last connection to close before
    reseting the schema.
<li>In the <a href="rtree.html">RTREE</a> extension, when rounding 64-bit floating point numbers
    to 32-bit for storage, always round in a direction that causes the
    bounding box to get larger.
<li>Adjust the unix driver to avoid unnecessary calls to fchown().
<li>Add interfaces sqlite3_quota_ferror() and sqlite3_quota_file_available()
    to the test_quota.c module.
<li>The <a href="c3ref/create_module.html">sqlite3_create_module()</a> and <a href="c3ref/create_module.html">sqlite3_create_module_v2()</a> interfaces
    return SQLITE_MISUSE on any attempt to overload or replace a <a href="vtab.html">virtual table</a>
    module.  The destructor is always called in this case, in accordance with
    historical and current documentation.
<li>SQLITE_SOURCE_ID: 
    "2012-06-11 02:05:22 f5b5a13f7394dc143aa136f1d4faba6839eaa6dc"
<li>SHA1 for sqlite3.c: ff0a771d6252545740ba9685e312b0e3bb6a641b
</ul></p><a name="version_3_7_12_1"></a>
<h3>2012 May 22 (3.7.12.1)</h3><p><ul>
<li>Fix a bug 
    <a href="http://www.sqlite.org/src/info/c2ad16f997ee9c">(ticket c2ad16f997)</a>
    in the 3.7.12 release that can cause a segfault for certain
    obscure nested aggregate queries.
<li>Fix various other minor test script problems.
<li>SQLITE_SOURCE_ID: 
    "2012-05-22 02:45:53 6d326d44fd1d626aae0e8456e5fa2049f1ce0789"
<li>SHA1 for sqlite3.c: d494e8d81607f0515d4f386156fb0fd86d5ba7df
</ul></p><a name="version_3_7_12"></a>
<h3>2012 May 14 (3.7.12)</h3><p><ul>
<li>Add the <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuscachewrite">SQLITE_DBSTATUS_CACHE_WRITE</a> option for <a href="c3ref/db_status.html">sqlite3_db_status()</a>.
<li>Optimize the <a href="lang_corefunc.html#typeof">typeof()</a> and <a href="lang_corefunc.html#length">length()</a> SQL functions so that they avoid
    unnecessary reading of database content from disk.
<li>Add the <a href="fts3.html#*fts4mergecmd">FTS4 "merge" command</a>, the <a href="fts3.html#*fts4automergecmd">FTS4 "automerge" command</a>, and
    the <a href="fts3.html#*fts4ickcmd">FTS4 "integrity-check" command</a>.
<li>Report the name of specific <a href="lang_createtable.html#ckconst">CHECK</a> constraints that fail.
<li>In the command-line shell, use popen() instead of fopen() if the first
    character of the argument to the ".output" command is "|".
<li>Make use of OVERLAPPED in the windows <a href="vfs.html">VFS</a> to avoid some system calls
    and thereby obtain a performance improvement.
<li>More aggressive optimization of the AND operator when one side or the
    other is always false.
<li>Improved performance of queries with many OR-connected terms in the
    WHERE clause that can all be indexed.
<li>Add the <a href="compile.html#rtree_int_only">SQLITE_RTREE_INT_ONLY</a> compile-time option to force the
    <a href="rtree.html">R*Tree Extension Module</a> to use integer instead of
    floating point values for both storage and computation.
<li>Enhance the <a href="pragma.html#pragma_integrity_check">PRAGMA integrity_check</a> command to use much less memory when
    processing multi-gigabyte databases.
<li>New interfaces added to the test_quota.c add-on module.
<li>Added the ".trace" dot-command to the command-line shell.
<li>Allow virtual table constructors to be invoked recursively.
<li>Improved optimization of ORDER BY clauses on compound queries.
<li>Improved optimization of aggregate subqueries contained within an
    aggregate query.
<li>Bug fix: Fix the <a href="lang_savepoint.html">RELEASE</a> command so that it does not cancel pending
    queries.  This repairs a problem introduced in 3.7.11.
<li>Bug fix: Do not discard the DISTINCT as superfluous unless a subset of
    the result set is subject to a UNIQUE constraint <em>and</em> it none
    of the columns in that subset can be NULL.
    Ticket <a href="http://www.sqlite.org/src/info/385a5b56b9">385a5b56b9</a>.
<li>Bug fix: Do not optimize away an ORDER BY clause that has the same terms
    as a UNIQUE index unless those terms are also NOT NULL.
    Ticket <a href="http://www.sqlite.org/src/info/2a5629202f">2a5629202f</a>.
<li>SQLITE_SOURCE_ID: 
    "2012-05-14 01:41:23 8654aa9540fe9fd210899d83d17f3f407096c004"
<li>SHA1 for sqlite3.c: 57e2104a0f7b3f528e7f6b7a8e553e2357ccd2e1

</ul></p><a name="version_3_7_11"></a>
<h3>2012 March 20 (3.7.11)</h3><p><ul>
<li>Enhance the <a href="lang_insert.html">INSERT</a> syntax to allow multiple rows to be inserted
    via the VALUES clause.
<li>Enhance the <a href="lang_createvtab.html">CREATE VIRTUAL TABLE</a> command to support the
    IF NOT EXISTS clause.
<li>Added the <a href="c3ref/stricmp.html">sqlite3_stricmp()</a> interface as a counterpart to
    <a href="c3ref/stricmp.html">sqlite3_strnicmp()</a>.
<li>Added the <a href="c3ref/db_readonly.html">sqlite3_db_readonly()</a> interface.
<li>Added the <a href="c3ref/c_fcntl_chunk_size.html#sqlitefcntlpragma">SQLITE_FCNTL_PRAGMA</a> file control, giving <a href="vfs.html">VFS</a> implementations
    the ability to add new <a href="pragma.html#syntax">PRAGMA</a> statements or to override built-in
    PRAGMAs.
<li>Queries of the form:  "SELECT max(x), y FROM table" returns the 
    value of y on the same row that contains the maximum x value.
<li>Added support for the <a href="fts3.html#*fts4languageid">FTS4 languageid option</a>.  
<li>Documented support for the <a href="fts3.html#*fts4content">FTS4 content option</a>.  This feature has
    actually been in the code since <a href="#version_3_7_9">version 3.7.9</a> but is only now considered
    to be officially supported.
<li>Pending statements no longer block <a href="lang_transaction.html">ROLLBACK</a>.  Instead, the pending
    statement will return SQLITE_ABORT upon next access after the ROLLBACK.
<li>Improvements to the handling of CSV inputs in the <a href="sqlite.html">command-line shell</a>
<li>Fix a <a href="http://www.sqlite.org/src/info/b7c8682cc1">bug</a> introduced 
    in <a href="#version_3_7_10">version 3.7.10</a> that might cause a LEFT JOIN
    to be incorrectly converted into an INNER JOIN if the WHERE clause
    indexable terms connected by OR.

<li>SQLITE_SOURCE_ID: 
    "2012-03-20 11:35:50 00bb9c9ce4f465e6ac321ced2a9d0062dc364669"
<li>SHA1 for sqlite3.c: d460d7eda3a9dccd291aed2a9fda868b9b120a10
</ul></p><a name="version_3_7_10"></a>
<h3>2012 January 16 (3.7.10)</h3><p><ul>
<li>The default <a href="fileformat2.html#schemaformat">schema format number</a> is changed from 1 to 4.
    This means that, unless
    the <a href="pragma.html#pragma_legacy_file_format">PRAGMA legacy_file_format=ON</a> statement is
    run, newly created database files will be unreadable by version of SQLite
    prior to 3.3.0 (2006-01-10).  It also means that the <a href="lang_createindex.html#descidx">descending indices</a>
    are enabled by default.
<li>The sqlite3_pcache_methods structure and the <a href="c3ref/c_config_getmalloc.html#sqliteconfigpcache">SQLITE_CONFIG_PCACHE</a>
    and <a href="c3ref/c_config_getmalloc.html#sqliteconfiggetpcache">SQLITE_CONFIG_GETPCACHE</a> configuration parameters are deprecated.
    They are replaced by a new <a href="c3ref/pcache_methods2.html">sqlite3_pcache_methods2</a> structure and
    <a href="c3ref/c_config_getmalloc.html#sqliteconfigpcache2">SQLITE_CONFIG_PCACHE2</a> and <a href="c3ref/c_config_getmalloc.html#sqliteconfiggetpcache2">SQLITE_CONFIG_GETPCACHE2</a> configuration
    parameters.
<li>Added the <a href="psow.html">powersafe overwrite</a> property to the VFS interface.  Provide
    the <a href="c3ref/c_iocap_atomic.html">SQLITE_IOCAP_POWERSAFE_OVERWRITE</a> I/O capability, the
    <a href="compile.html#powersafe_overwrite">SQLITE_POWERSAFE_OVERWRITE</a> compile-time option, and the
    "psow=BOOLEAN" query parameter for <a href="uri.html">URI filenames</a>.
<li>Added the <a href="c3ref/db_release_memory.html">sqlite3_db_release_memory()</a> interface and the
    <a href="pragma.html#pragma_shrink_memory">shrink_memory pragma</a>.
<li>Added the <a href="c3ref/db_filename.html">sqlite3_db_filename()</a> interface.
<li>Added the <a href="c3ref/stmt_busy.html">sqlite3_stmt_busy()</a> interface.
<li>Added the <a href="c3ref/uri_boolean.html">sqlite3_uri_boolean()</a> and <a href="c3ref/uri_boolean.html">sqlite3_uri_int64()</a> interfaces.
<li>If the argument to <a href="pragma.html#pragma_cache_size">PRAGMA cache_size</a> is negative N, that means to use
    approximately -1024*N bytes of memory for the page cache regardless of
    the page size.
<li>Enhanced the default memory allocator to make use of _msize() on windows,
    malloc_size() on Mac, and malloc_usable_size() on Linux.
<li>Enhanced the query planner to support index queries with range constraints
    on the rowid.
<li>Enhanced the query planner flattening logic to allow UNION ALL compounds
    to be promoted upwards to replace a simple wrapper SELECT even if the
    compounds are joins.
<li>Enhanced the query planner so that the xfer optimization can be used with
    INTEGER PRIMARY KEY ON CONFLICT as long as the destination table is
    initially empty.
<li>Enhanced the windows <a href="vfs.html">VFS</a> so that all system calls can be overridden
    using the xSetSystemCall interface.
<li>Updated the "unix-dotfile" <a href="vfs.html">VFS</a> to use locking directories with mkdir()
    and rmdir() instead of locking files with open() and unlink().
<li>Enhancements to the test_quota.c extension to support stdio-like interfaces
    with quotas.
<li>Change the unix <a href="vfs.html">VFS</a> to be tolerant of read() system calls that return 
    less then the full number of requested bytes.
<li>Change both unix and windows <a href="vfs.html">VFSes</a> to report a sector size of 4096
    instead of the old default of 512.
<li>In the <a href="tclsqlite.html">TCL Interface</a>, add the -uri option to the "sqlite3" TCL command
    used for creating new database connection objects.
<li>Added the <a href="c3ref/c_testctrl_always.html">SQLITE_TESTCTRL_EXPLAIN_STMT</a> test-control option with the
    <a href="compile.html#enable_tree_explain">SQLITE_ENABLE_TREE_EXPLAIN</a> compile-time option to enable the
    <a href="sqlite.html">command-line shell</a> to display ASCII-art parse trees of SQL statements
    that it processes, for debugging and analysis.
<li><b>Bug fix:</b>
    Add an additional xSync when restarting a WAL in order to prevent an
    exceedingly unlikely but theoretically possible
    database corruption following power-loss.
    Ticket <a href="http://www.sqlite.org/src/info/ff5be73dee">ff5be73dee</a>.
<li><b>Bug fix:</b>
    Change the VDBE so that all registers are initialized to Invalid
    instead of NULL.
    Ticket <a href="http://www.sqlite.org/src/info/7bbfb7d442">7bbfb7d442</a>
<li><b>Bug fix:</b>
    Fix problems that can result from 32-bit integer overflow.
    Ticket <a href="http://www.sqlite.org/src/info/ac0ff496b7e2">ac00f496b7e2</a>
<li>SQLITE_SOURCE_ID: 
    "2012-01-16 13:28:40 ebd01a8deffb5024a5d7494eef800d2366d97204"
<li>SHA1 for sqlite3.c: 6497cbbaad47220bd41e2e4216c54706e7ae95d4
</ul></p><a name="version_3_7_9"></a>
<h3>2011 November 1 (3.7.9)</h3><p><ul>
<li>If a search token (on the right-hand side of the MATCH operator) in
    <a href="fts3.html#fts4">FTS4</a> begins with "&#94;" then that token must be the first in its field
    of the document.  <b>** Potentially Incompatible Change **</b>
<li>Added options <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuscachehit">SQLITE_DBSTATUS_CACHE_HIT</a> and <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuscachemiss">SQLITE_DBSTATUS_CACHE_MISS</a>
    to the <a href="c3ref/db_status.html">sqlite3_db_status()</a> interface.
<li>Removed support for <a href="compile.html#enable_stat2">SQLITE_ENABLE_STAT2</a>, replacing it with the much
    more capable <a href="compile.html#enable_stat3">SQLITE_ENABLE_STAT3</a> option.
<li>Enhancements to the sqlite3_analyzer utility program, including the
    --pageinfo and --stats options and support for multiplexed databases.
<li>Enhance the <a href="c3ref/data_count.html">sqlite3_data_count()</a> interface so that it can be used to
    determine if SQLITE_DONE has been seen on the prepared statement.
<li>Added the <a href="c3ref/c_fcntl_chunk_size.html#sqlitefcntloverwrite">SQLITE_FCNTL_OVERWRITE</a> file-control by which the SQLite core
    indicates to the VFS that the current transaction will overwrite the
    entire database file.
<li>Increase the default <a href="malloc.html#lookaside">lookaside memory allocator</a> allocation size from
    100 to 128 bytes.
<li>Enhanced the query planner so that it can factor terms in and out of
    OR expressions in the WHERE clause in an effort to find better indices.
<li>Added the <a href="compile.html#direct_overflow_read">SQLITE_DIRECT_OVERFLOW_READ</a> compile-time option, causing
    <a href="fileformat2.html#ovflpgs">overflow pages</a> to be read directly from the database file, 
    bypassing the <a href="c3ref/pcache_methods2.html">page cache</a>.
<li>Remove limits on the magnitude of precision and width value in the
    format specifiers of the <a href="c3ref/mprintf.html">sqlite3_mprintf()</a> family of string rendering
    routines.
<li>Fix a bug that prevent <a href="lang_altertable.html">ALTER TABLE ... RENAME</a> from working
    on some virtual tables in a database with a UTF16 encoding.
<li>Fix a bug in ASCII-to-float conversion that causes slow performance and
    incorrect results when converting numbers with ridiculously large exponents.
<li>Fix a bug that causes incorrect results in aggregate queries that use
    multiple aggregate functions whose arguments contain complicated expressions
    that differ only in the case of string literals contained within those
    expressions.
<li>Fix a bug that prevented the <a href="pragma.html#pragma_page_count">page_count</a> and <a href="pragma.html#pragma_quick_check">quick_check</a> pragmas from
    working correctly if their names were capitalized.
<li>Fix a bug that caused <a href="lang_vacuum.html">VACUUM</a> to fail if the <a href="pragma.html#pragma_count_changes">count_changes pragma</a> was
    engaged.
<li>Fix a bug in <a href="vtab.html">virtual table</a> implementation that causes a crash if
    an <a href="fts3.html#fts4">FTS4</a> table is <a href="lang_droptable.html">dropped</a> inside a transaction and
    a <a href="lang_savepoint.html">SAVEPOINT</a> occurs afterwards.
<li>SQLITE_SOURCE_ID: 
    "2011-11-01 00:52:41 c7c6050ef060877ebe77b41d959e9df13f8c9b5e"
<li>SHA1 for sqlite3.c: becd16877f4f9b281b91c97e106089497d71bb47
</ul></p><a name="version_3_7_8"></a>
<h3>2011 September 19 (3.7.8)</h3><p><ul>
<li> Orders of magnitude performance improvement for <a href="lang_createindex.html">CREATE INDEX</a> on
     very large tables.
<li> Improved the windows VFS to better defend against interference
     from anti-virus software.
<li> Improved query plan optimization when the DISTINCT keyword is present.
<li> Allow more system calls to be overridden in the unix VFS - to provide
     better support for chromium sandboxes.
<li> Increase the default size of a lookahead cache line from 100 to 128 bytes.
<li> Enhancements to the test_quota.c module so that it can track 
     preexisting files.
<li> Bug fix: Virtual tables now handle IS NOT NULL constraints correctly.
<li> Bug fixes: Correctly handle nested correlated subqueries used with
     indices in a WHERE clause.
<li> SQLITE_SOURCE_ID:
    "2011-09-19 14:49:19 3e0da808d2f5b4d12046e05980ca04578f581177"
<li> SHA1 for sqlite3.c: bfcd74a655636b592c5dba6d0d5729c0f8e3b4de
</ul></p><a name="version_3_7_7_1"></a>
<h3>2011 June 28 (3.7.7.1)</h3><p><ul>
<li> Fix <a href="http://www.sqlite.org/src/info/25ee812710">a bug</a> causing 
     <a href="pragma.html#pragma_case_sensitive_like">PRAGMA case_sensitive_like</a> statements compiled using sqlite3_prepare()
     to fail with an <a href="c3ref/c_abort.html">SQLITE_SCHEMA</a> error.
<li> SQLITE_SOURCE_ID:
    "2011-06-28 17:39:05 af0d91adf497f5f36ec3813f04235a6e195a605f"
<li> SHA1 for sqlite3.c: d47594b8a02f6cf58e91fb673e96cb1b397aace0
</ul></p><a name="version_3_7_7"></a>
<h3>2011 June 24 (3.7.7)</h3><p><ul>
<li> Add support for <a href="uri.html">URI filenames</a>
<li> Add the <a href="c3ref/vtab_config.html">sqlite3_vtab_config()</a> interface in
     support of <a href="lang_conflict.html">ON CONFLICT</a> clauses with <a href="vtab.html">virtual tables</a>.
<li> Add the <a href="vtab.html#xsavepoint">xSavepoint</a>, <a href="vtab.html#xsavepoint">xRelease</a> and <a href="vtab.html#xsavepoint">xRollbackTo</a> methods in
     <a href="vtab.html">virtual tables</a> in support of <a href="lang_savepoint.html">SAVEPOINT</a> for virtual tables.
<li> Update the built-in <a href="fts3.html">FTS3/FTS4</a> and <a href="rtree.html">RTREE</a> virtual tables to support
     <a href="lang_conflict.html">ON CONFLICT</a> clauses and <a href="lang_replace.html">REPLACE</a>.
<li> Avoid unnecessary reparsing of the database schema.
<li> Added support for the <a href="fts3.html#fts4prefix">FTS4 prefix option</a> and the <a href="fts3.html#fts4order">FTS4 order option</a>.
<li> Allow <a href="wal.html">WAL-mode</a> databases to be opened read-only as long as
     there is an existing read/write connection.
<li> Added support for <a href="shortnames.html">short filenames</a>.
<li> SQLITE_SOURCE_ID:
     "2011-06-23 19:49:22 4374b7e83ea0a3fbc3691f9c0c936272862f32f2"
<li> SHA1 for sqlite3.c: 5bbe79e206ae5ffeeca760dbd0d66862228db551
</ul></p><a name="version_3_7_6_3"></a>
<h3>2011 May 19 (3.7.6.3)</h3><p><ul>
<li> Fix a problem with <a href="wal.html">WAL mode</a> which could cause transactions to
     silently rollback if the <a href="pragma.html#pragma_cache_size">cache_size</a> is set very small (less than 10)
     and SQLite comes under memory pressure.
</ul></p><a name="version_3_7_6_2"></a>
<h3>2011 April 17 (3.7.6.2)</h3><p><ul>
<li> Fix the function prototype for the open(2) system call to agree with
     POSIX.  Without this fix, pthreads does not work correctly on NetBSD.
<li> SQLITE_SOURCE_ID:
     "2011-04-17 17:25:17 154ddbc17120be2915eb03edc52af1225eb7cb5e"
<li> SHA1 for sqlite3.c: 806577fd524dd5f3bfd8d4d27392ed2752bc9701

</ul></p><a name="version_3_7_6_1"></a>
<h3>2011 April 14 (3.7.6.1)</h3><p><ul>
<li> Fix a bug in 3.7.6 that only appears if the <a href="c3ref/c_fcntl_chunk_size.html#sqlitefcntlsizehint">SQLITE_FCNTL_SIZE_HINT</a>
     file control is used with a build of SQLite that makes use of the
     HAVE_POSIX_FALLOCATE compile-time option and which has
     SQLITE_ENABLE_LOCKING_MODE turned off.
<li> SQLITE_SOURCE_ID:
     "2011-04-13 14:40:25 a35e83eac7b185f4d363d7fa51677f2fdfa27695"
<li> SHA1 for sqlite3.c: b81bfa27d3e09caf3251475863b1ce6dd9f6ab66
</ul></p><a name="version_3_7_6"></a>
<h3>2011 April 12 (3.7.6)</h3><p><ul>
<li> Added the <a href="c3ref/wal_checkpoint_v2.html">sqlite3_wal_checkpoint_v2()</a> interface and enhanced the
     <a href="pragma.html#pragma_wal_checkpoint">wal_checkpoint pragma</a> to support blocking checkpoints.
<li> Improvements to the query planner so that it makes better estimates of
     plan costs and hence does a better job of choosing the right plan,
     especially when <a href="compile.html#enable_stat2">SQLITE_ENABLE_STAT2</a> is used.
<li> Fix a bug which prevented deferred foreign key constraints from being
     enforced when <a href="c3ref/finalize.html">sqlite3_finalize()</a> was not
     called by one statement with a failed foreign key constraint prior to
     another statement with foreign key constraints running.
<li> Integer arithmetic operations that would have resulted in overflow
     are now performed using floating-point instead.
<li> Increased the version number on the <a href="c3ref/vfs.html">VFS object</a> to
     3 and added new methods xSetSysCall, xGetSysCall, and xNextSysCall
     used for doing full-coverage testing.
<li> Increase the maximum value of <a href="limits.html#max_attached">SQLITE_MAX_ATTACHED</a> from 30 to 62
     (though the default value remains at 10).
<li> Enhancements to FTS4:
     <ol type="a">
     <li> Added the <a href="fts3.html#fts4aux">fts4aux</a> table
     <li> Added support for <a href="fts3.html#*fts4compression">compressed FTS4 content</a>
     </ol>
<li> Enhance the <a href="lang_analyze.html">ANALYZE</a> command to support the name of an index
     as its argument, in order to analyze just that one index.
<li> Added the "unix-excl" built-in VFS on unix and unix-like platforms.
<li> SQLITE_SOURCE_ID:
     "2011-04-12 01:58:40 f9d43fa363d54beab6f45db005abac0a7c0c47a7"
<li> SHA1 for sqlite3.c: f38df08547efae0ff4343da607b723f588bbd66b
</ul></p><a name="version_3_7_5"></a>
<h3>2011 February 01 (3.7.5)</h3><p><ul>
<li> Added the <a href="c3ref/mprintf.html">sqlite3_vsnprintf()</a> interface.
<li> Added the <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuslookasidehit">SQLITE_DBSTATUS_LOOKASIDE_HIT</a>,
     <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuslookasidemisssize">SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE</a>, and
     <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuslookasidemissfull">SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL</a> options for the
     <a href="c3ref/db_status.html">sqlite3_db_status()</a> interface.
<li> Added the <a href="compile.html#omit_autoreset">SQLITE_OMIT_AUTORESET</a> compile-time option.
<li> Added the <a href="compile.html#default_foreign_keys">SQLITE_DEFAULT_FOREIGN_KEYS</a> compile-time option.
<li> Updates to <a href="c3ref/stmt_readonly.html">sqlite3_stmt_readonly()</a> so that its result is well-defined
     for all prepared statements and so that it works with <a href="lang_vacuum.html">VACUUM</a>.
<li> Added the "-heap" option to the <a href="sqlite.html">command-line shell</a>
<li> Fix <a href="http://www.sqlite.org/src/info/5d863f876e">a bug</a> involving
     frequent changes in and out of WAL mode and
     VACUUM that could (in theory) cause database corruption.
<li> Enhance the <a href="c3ref/profile.html">sqlite3_trace()</a> mechanism so that nested SQL statements
     such as might be generated by virtual tables are shown but are shown
     in comments and without parameter expansion.  This 
     greatly improves tracing output when using the FTS3/4 and/or RTREE
     virtual tables.
<li> Change the xFileControl() methods on all built-in VFSes to return
     <a href="c3ref/c_abort.html">SQLITE_NOTFOUND</a> instead of <a href="c3ref/c_abort.html">SQLITE_ERROR</a> for an unrecognized
     operation code.
<li> The SQLite core invokes the <a href="c3ref/c_fcntl_chunk_size.html#sqlitefcntlsyncomitted">SQLITE_FCNTL_SYNC_OMITTED</a> 
     <a href="c3ref/file_control.html">file control</a>
     to the VFS in place of a call to xSync if the database has
     <a href="pragma.html#pragma_synchronous">PRAGMA synchronous</a> set to OFF.
</ul></p><a name="version_3_7_4"></a>
<h3>2010 December 08 (3.7.4)</h3><p><ul>
<li> Added the <a href="c3ref/blob_reopen.html">sqlite3_blob_reopen()</a> interface to allow an existing
     <a href="c3ref/blob.html">sqlite3_blob</a> object to be rebound to a new row.
<li> Use the new <a href="c3ref/blob_reopen.html">sqlite3_blob_reopen()</a> interface to improve the performance
     of FTS.
<li> <a href="c3ref/vfs.html">VFSes</a> that do not support shared memory are allowed
     to access <a href="wal.html">WAL</a> databases if <a href="pragma.html#pragma_locking_mode">PRAGMA locking_mode</a> is set to EXCLUSIVE.
<li> Enhancements to <a href="eqp.html">EXPLAIN QUERY PLAN</a>.
<li> Added the <a href="c3ref/stmt_readonly.html">sqlite3_stmt_readonly()</a> interface.
<li> Added <a href="pragma.html#pragma_checkpoint_fullfsync">PRAGMA checkpoint_fullfsync</a>.
<li> Added the <a href="c3ref/c_fcntl_chunk_size.html#sqlitefcntlfilepointer">SQLITE_FCNTL_FILE_POINTER</a> option
     to <a href="c3ref/file_control.html">sqlite3_file_control()</a>.
<li> Added support for <a href="fts3.html#fts4">FTS4</a> and enhancements 
     to the FTS <a href="fts3.html#matchinfo">matchinfo()</a> function.
<li> Added the test_superlock.c module which provides example
     code for obtaining an exclusive lock to a rollback
     or WAL database.  
<li> Added the test_multiplex.c module which provides
     an example VFS that provides multiplexing (sharding)
     of a DB, splitting it over multiple files of fixed size.
<li> A <a href="http://www.sqlite.org/src/info/80ba201079">very obscure bug</a>
     associated with the <a href="optoverview.html#or_opt">or optimization</a> was fixed.
</ul></p><a name="version_3_7_3"></a>
<h3>2010 October 08 (3.7.3)</h3><p><ul>
<li> Added the <a href="c3ref/create_function.html">sqlite3_create_function_v2()</a> interface that includes a
     destructor callback.
<li> Added support for <a href="rtree.html#customquery">custom r-tree queries</a> using application-supplied
     callback routines to define the boundary of the query region.
<li> The default page cache strives more diligently to avoid using memory
     beyond what is allocated to it by <a href="c3ref/c_config_getmalloc.html#sqliteconfigpagecache">SQLITE_CONFIG_PAGECACHE</a>.  Or if
     using page cache is allocating from the heap, it strives to avoid
     going over the <a href="c3ref/soft_heap_limit64.html">sqlite3_soft_heap_limit64()</a>, even if
     <a href="compile.html#enable_memory_management">SQLITE_ENABLE_MEMORY_MANAGEMENT</a> is not set.
<li> Added the <a href="c3ref/soft_heap_limit64.html">sqlite3_soft_heap_limit64()</a> interface as a replacement for
     <a href="c3ref/soft_heap_limit.html">sqlite3_soft_heap_limit()</a>.
<li> The <a href="lang_analyze.html">ANALYZE</a> command now gathers statistics on tables even if they 
     have no indices.
<li> Tweaks to the query planner to help it do a better job of finding the
     most efficient query plan for each query.
<li> Enhanced the internal text-to-numeric conversion routines so that they
     work with UTF8 or UTF16, thereby avoiding some UTF16-to-UTF8 text
     conversions.
<li> Fix a problem that was causing excess memory usage with large <a href="wal.html">WAL</a>
     transactions in win32 systems.
<li> The interface between the VDBE and B-Tree layer is enhanced such that
     the VDBE provides hints to the B-Tree layer letting the B-Tree layer
     know when it is safe to use hashing instead of B-Trees for transient
     tables.
<li> Miscellaneous documentation enhancements.
</ul></p><a name="version_3_7_2"></a>
<h3>2010 August 24 (3.7.2)</h3><p><ul>
<li> Fix an <a href="http://www.sqlite.org/src/info/5e10420e8d">
     old and very obscure bug</a> that can lead to corruption of the
     database <a href="fileformat2.html#freelist">free-page list</a> when <a href="pragma.html#pragma_incremental_vacuum">incremental_vacuum</a> is used.
</ul></p><a name="version_3_7_1"></a>
<h3>2010 August 23 (3.7.1)</h3><p><ul>
<li> Added new commands <a href="c3ref/c_dbstatus_options.html#sqlitedbstatusschemaused">SQLITE_DBSTATUS_SCHEMA_USED</a> and
     <a href="c3ref/c_dbstatus_options.html#sqlitedbstatusstmtused">SQLITE_DBSTATUS_STMT_USED</a> to the <a href="c3ref/db_status.html">sqlite3_db_status()</a> interface, in
     order to report out the amount of memory used to hold the schema and
     prepared statements of a connection.
<li> Increase the maximum size of a database pages from 32KiB to 64KiB.
<li> Use the <a href="optoverview.html#like_opt">LIKE optimization</a> even if the right-hand side string contains
     no wildcards.
<li> Added the <a href="c3ref/c_fcntl_chunk_size.html#sqlitefcntlchunksize">SQLITE_FCNTL_CHUNK_SIZE</a> verb to the <a href="c3ref/file_control.html">sqlite3_file_control()</a>
     interface for both unix and windows, to cause database files to grow in
     large chunks in order to reduce disk fragmentation.
<li> Fixed a bug in the query planner that caused performance regressions
     relative to 3.6.23.1 on some complex joins.
<li> Fixed a typo in the OS/2 backend.
<li> Refactored the pager module.
<li> The SQLITE_MAX_PAGE_SIZE compile-time option is now silently ignored.
     The maximum page size is hard-coded at 65536 bytes.
</ul></p><a name="version_3_7_0_1"></a>
<h3>2010 August 04 (3.7.0.1)</h3><p><ul>
<li> Fix a potential database corruption bug that can occur if version 3.7.0
     and version 3.6.23.1 alternately write to the same database file.
     <a href="http://www.sqlite.org/src/info/51ae9cad317a1">
     Ticket &#91;51ae9cad317a1&#93;</a>
<li> Fix a performance regression related to the query planner enhancements
     of version 3.7.0.
</ul></p><a name="version_3_7_0"></a>
<h3>2010 July 22 (3.7.0)</h3><p><ul>
<li> Added support for <a href="wal.html">write-ahead logging</a>.
<li> Query planner enhancement - automatic transient indices are created
     when doing so reduces the estimated query time.
<li> Query planner enhancement - the ORDER BY becomes a no-op if the query
     also contains a GROUP BY clause that forces the correct output order.
<li> Add the <a href="c3ref/c_dbstatus_options.html#sqlitedbstatuscacheused">SQLITE_DBSTATUS_CACHE_USED</a> verb for <a href="c3ref/db_status.html">sqlite3_db_status()</a>.
<li> The logical database size is now stored in the database header so that
     bytes can be appended to the end of the database file without corrupting
     it and so that SQLite will work correctly on systems that lack support
     for ftruncate().
</ul></p><a name="version_3_6_23_1"></a>
<h3>2010 March 30 (3.6.23.1)</h3><p><ul>
<li> Fix a bug in the offsets() function of <a href="fts3.html">FTS3</a>
<li> Fix a missing "sync" that when omitted could lead to database
     corruption if a power failure or OS crash occurred just as a
     ROLLBACK operation was finishing.
</ul></p><a name="version_3_6_23"></a>
<h3>2010 March 09 (3.6.23)</h3><p><ul>
<li> Added the <a href="pragma.html#pragma_secure_delete">secure_delete pragma</a>.
<li> Added the <a href="c3ref/compileoption_get.html">sqlite3_compileoption_used()</a> and
     <a href="c3ref/compileoption_get.html">sqlite3_compileoption_get()</a> interfaces as well as the
     <a href="pragma.html#pragma_compile_options">compile_options pragma</a> and the <a href="lang_corefunc.html#sqlite_compileoption_used">sqlite_compileoption_used()</a> and
     <a href="lang_corefunc.html#sqlite_compileoption_get">sqlite_compileoption_get()</a> SQL functions.
<li> Added the <a href="c3ref/log.html">sqlite3_log()</a> interface together with the
     <a href="c3ref/c_config_getmalloc.html#sqliteconfiglog">SQLITE_CONFIG_LOG</a> verb to <a href="c3ref/config.html">sqlite3_config()</a>.  The ".log" command
     is added to the <a href="sqlite.html">Command Line Interface</a>.
<li> Improvements to <a href="fts3.html">FTS3</a>.
<li> Improvements and bug-fixes in support for <a href="compile.html#omit_floating_point">SQLITE_OMIT_FLOATING_POINT</a>.
<li> The <a href="pragma.html#pragma_integrity_check">integrity_check pragma</a> is enhanced to detect out-of-order rowids.
<li> The ".genfkey" operator has been removed from the
     <a href="sqlite.html">Command Line Interface</a>.
<li> Updates to the co-hosted Lemon LALR(1) parser generator. (These
     updates did not affect SQLite.)
<li> Various minor bug fixes and performance enhancements.
</ul></p><a name="version_3_6_22"></a>
<h3>2010 Jan 06 (3.6.22)</h3><p><ul>
<li>Fix bugs that can (rarely) lead to incorrect query results when
    the CAST or OR operators are used in the WHERE clause of a query.
<li>Continuing enhancements and improvements to <a href="fts3.html">FTS3</a>.
<li>Other miscellaneous bug fixes.
</ul></p><a name="version_3_6_21"></a>
<h3>2009 Dec 07 (3.6.21)</h3><p><ul>
<li>The SQL output resulting from <a href="c3ref/profile.html">sqlite3_trace()</a> is now modified to include
the values of <a href="lang_expr.html#varparam">bound parameters</a>.
<li>Performance optimizations targeting a specific use case from
a single high-profile user of SQLite.  A 12% reduction in the number of
CPU operations is achieved (as measured by Valgrind).  Actual performance
improvements in practice may vary depending on workload.  Changes
include:
<ul>
<li>The <a href="lang_corefunc.html#ifnull">ifnull()</a> and <a href="lang_corefunc.html#coalesce">coalesce()</a> SQL functions are now implemented
using in-line VDBE code rather than calling external functions, so that
unused arguments need never be evaluated.
<li>The <a href="lang_corefunc.html#substr">substr()</a> SQL function does not bother to measure the length
its entire input string if it is only computing a prefix
<li>Unnecessary OP_IsNull, OP_Affinity, and OP_MustBeInt VDBE opcodes
are suppressed
<li>Various code refactorizations for performance
</ul>
<li>The FTS3 extension has undergone a major rework and cleanup.
New <a href="fts3.html">FTS3 documentation</a> is now available.
<li>The <a href="compile.html#secure_delete">SQLITE_SECURE_DELETE</a> compile-time option fixed to make sure that
content is deleted even when the <a href="lang_delete.html#truncateopt">truncate optimization</a> applies.
<li>Improvements to "dot-command" handling in the
<a href="sqlite.html">Command Line Interface</a>.
<li>Other minor bug fixes and documentation enhancements.
</ul></p><a name="version_3_6_20"></a>
<h3>2009 Nov 4 (3.6.20)</h3><p><ul>
<li>Optimizer enhancement: <a href="c3ref/stmt.html">prepared statements</a> are automatically 
re-compiled when a binding on the RHS of a LIKE operator changes or
when any range constraint changes under <a href="compile.html#enable_stat2">SQLITE_ENABLE_STAT2</a>.
<li>Various minor bug fixes and documentation enhancements.
</ul></p><a name="version_3_6_16_1"></a>
<h3>2009 Oct 30 (3.6.16.1)</h3><p><ul>
<li>A small patch to version 3.6.16 to fix 
<a href="http://www.sqlite.org/src/info/6b00e0a34c">the OP_If bug</a>.
</ul></p><a name="version_3_6_19"></a>
<h3>2009 Oct 14 (3.6.19)</h3><p><ul>
<li>Added support for <a href="foreignkeys.html">foreign key constraints</a>.  Foreign key constraints
    are disabled by default.  Use the <a href="pragma.html#pragma_foreign_keys">foreign_keys pragma</a> to turn them on.
<li>Generalized the IS and IS NOT operators to take arbitrary expressions
    on their right-hand side.
<li>The <a href="tclsqlite.html">TCL Interface</a> has been enhanced to use the
    <a href="http://www.tcl.tk/cgi-bin/tct/tip/322.html">Non-Recursive Engine (NRE)</a>
    interface to the TCL interpreter when linked against TCL 8.6 or later.
<li>Fix a bug introduced in 3.6.18 that can lead to a segfault when an
    attempt is made to write on a read-only database.
</ul></p><a name="version_3_6_18"></a>
<h3>2009 Sep 11 (3.6.18)</h3><p><ul>
<li>Versioning of the SQLite source code has transitioned from CVS to
    <a href="http://www.fossil-scm.org/">Fossil</a>.
<li>Query planner enhancements.
<li>The <a href="compile.html#enable_stat2">SQLITE_ENABLE_STAT2</a> compile-time option causes the <a href="lang_analyze.html">ANALYZE</a> 
    command to collect a small histogram of each index, to help SQLite better
    select among competing range query indices.
<li>Recursive triggers can be enabled using the <a href="pragma.html#pragma_recursive_triggers">PRAGMA recursive_triggers</a>
    statement.  
<li>Delete triggers fire when rows are removed due to a 
    <a href="lang_conflict.html">REPLACE conflict resolution</a>.  This feature is only
    enabled when recursive triggers are enabled.
<li>Added the <a href="c3ref/c_open_autoproxy.html">SQLITE_OPEN_SHAREDCACHE</a> and <a href="c3ref/c_open_autoproxy.html">SQLITE_OPEN_PRIVATECACHE</a>
    flags for <a href="c3ref/open.html">sqlite3_open_v2()</a> used to override the global
    <a href="sharedcache.html">shared cache mode</a> settings for individual database connections.
<li>Added improved version identification features:
    C-Preprocessor macro <a href="c3ref/c_source_id.html">SQLITE_SOURCE_ID</a>,
    C/C++ interface <a href="c3ref/libversion.html">sqlite3_sourceid()</a>, and SQL function <a href="lang_corefunc.html#sqlite_source_id">sqlite_source_id()</a>.
<li>Obscure bug fix on triggers
(<a href="http://www.sqlite.org/src/info/efc02f9779">&#91;efc02f9779&#93;</a>).
</ul></p><a name="version_3_6_17"></a>
<h3>2009 Aug 10 (3.6.17)</h3><p><ul>
<li>Expose the <a href="c3ref/stricmp.html">sqlite3_strnicmp()</a> interface for use by extensions and
    applications.
<li>Remove the restriction on <a href="vtab.html">virtual tables</a> and <a href="sharedcache.html">shared cache mode</a>.
    Virtual tables and shared cache can now be used at the same time.
<li>Many code simplifications and obscure bug fixes in support of
    providing <a href="testing.html#coverage">100% branch test coverage</a>.
</ul></p><a name="version_3_6_16"></a>
<h3>2009 June 27 (3.6.16)</h3><p><ul>
<li>Fix a bug (ticket #3929) that occasionally causes INSERT or UPDATE
    operations to fail on an indexed table that has a self-modifying trigger.
<li>Other minor bug fixes and performance optimizations.
</ul></p><a name="version_3_6_15"></a>
<h3>2009 June 15 (3.6.15)</h3><p><ul>
<li>Refactor the internal representation of SQL expressions so that they
    use less memory on embedded platforms.
<li>Reduce the amount of stack space used
<li>Fix an 64-bit alignment bug on HP/UX and Sparc
<li>The <a href="c3ref/create_function.html">sqlite3_create_function()</a> family of interfaces now return
    <a href="c3ref/c_abort.html">SQLITE_MISUSE</a> instead of <a href="c3ref/c_abort.html">SQLITE_ERROR</a> when passed invalid
    parameter combinations.
<li>When new tables are created using CREATE TABLE ... AS SELECT ... the
    datatype of the columns is the simplified SQLite datatype (TEXT, INT,
    REAL, NUMERIC, or BLOB) instead of a copy of the original datatype from
    the source table.
<li>Resolve race conditions when checking for a hot rollback journal.
<li>The <a href="c3ref/initialize.html">sqlite3_shutdown()</a> interface frees all mutexes under windows.
<li>Enhanced robustness against corrupt database files
<li>Continuing improvements to the test suite and fixes to obscure
    bugs and inconsistencies that the test suite improvements are
    uncovering.
   
</ul></p><a name="version_3_6_14_2"></a>
<h3>2009 May 25 (3.6.14.2)</h3><p><ul>
<li>Fix a code generator bug introduced in <a href="#version_3_6_14">version 3.6.14</a>.  This bug
    can cause incorrect query results under obscure circumstances.
    <a href="http://www.sqlite.org/cvstrac/tktview?tn=3879">Ticket #3879</a>.
</ul></p><a name="version_3_6_14_1"></a>
<h3>2009 May 19 (3.6.14.1)</h3><p><ul>
<li>Fix a bug in <a href="lang_aggfunc.html#groupconcat">group_concat()</a>, <a href="http://www.sqlite.org/cvstrac/tktview?tn=3841">ticket #3841</a>
<li>Fix a performance bug in the pager cache, <a href="http://www.sqlite.org/cvstrac/tktview?tn=3844">ticket #3844</a>
<li>Fix a bug in the <a href="c3ref/backup.html">sqlite3_backup</a> implementation that can lead
    to a corrupt backup database.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=3858">Ticket #3858</a>.
</ul></p><a name="version_3_6_14"></a>
<h3>2009 May 7 (3.6.14)</h3><p><ul>
<li>Added the optional <a href="asyncvfs.html">asynchronous VFS</a> module.</li>
<li>Enhanced the query optimizer so that <a href="vtab.html">virtual tables</a> are able to
    make use of OR and IN operators in the WHERE clause.</li>
<li>Speed improvements in the btree and pager layers.</li>
<li>Added the <a href="compile.html#have_isnan">SQLITE_HAVE_ISNAN</a> compile-time option which will cause
    the isnan() function from the standard math library to be used instead
    of SQLite's own home-brew NaN checker.</li>
<li>Countless minor bug fixes, documentation improvements, new and
    improved test cases, and code simplifications and cleanups.</p>
</ul></p><a name="version_3_6_13"></a>
<h3>2009 April 13 (3.6.13)</h3><p><ul>
<li>Fix a bug in <a href="#version_3_6_12">version 3.6.12</a> that causes a segfault when running
    a count(*) on the sqlite_master table of an empty database. Ticket #3774.
<li>Fix a bug in <a href="#version_3_6_12">version 3.6.12</a> that causes a segfault that when 
    inserting into a table using a DEFAULT value where there is a 
    function as part of the DEFAULT value expression.  Ticket #3791.
<li>Fix data structure alignment issues on Sparc.  Ticket #3777.
<li>Other minor bug fixes.
</ul></p><a name="version_3_6_12"></a>
<h3>2009 March 31 (3.6.12)</h3><p><ul>
<li>Fixed a bug that caused database corruption when an <a href="pragma.html#pragma_incremental_vacuum">incremental_vacuum</a> is
    rolled back in an in-memory database.  Ticket #3761.
<li>Added the <a href="c3ref/unlock_notify.html">sqlite3_unlock_notify()</a> interface.
<li>Added the <a href="pragma.html#pragma_reverse_unordered_selects">reverse_unordered_selects pragma</a>.
<li>The default page size on windows is automatically adjusted to match the
    capabilities of the underlying filesystem.
<li>Add the new ".genfkey" command in the <a href="sqlite.html">CLI</a> for generating triggers to
    implement foreign key constraints.
<li>Performance improvements for "count(*)" queries.
<li>Reduce the amount of heap memory used, especially by TRIGGERs.
<li>
</ul></p><a name="version_3_6_11"></a>
<h3>2009 Feb 18 (3.6.11)</h3><p><ul>
<li>Added the <a href="c3ref/backup_finish.html#sqlite3backupinit">hot-backup interface</a>.
<li>Added new commands ".backup" and ".restore" to the <a href="sqlite.html">CLI</a>.
<li>Added new methods <a href="tclsqlite.html#backup">backup</a> and
    <a href="tclsqlite.html#restore">restore</a> to the TCL interface.
<li>Improvements to the <a href="syntaxdiagrams.html">syntax bubble
    diagrams</a>
<li>Various minor bug fixes
</ul></p><a name="version_3_6_10"></a>
<h3>2009 Jan 15 (3.6.10)</h3><p><ul>
<li>Fix a cache coherency problem that could lead to database corruption.
    <a href="http://www.sqlite.org/cvstrac/tktview?tn=3584">Ticket #3584</a>.
</ul></p><a name="version_3_6_9"></a>
<h3>2009 Jan 14 (3.6.9)</h3><p><ul>
<li>Fix two bugs, which when combined might result in incorrect
    query results.  Both bugs were harmless by themselves; only when
    they team up do they cause problems.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=3581">Ticket #3581</a>.
</ul></p><a name="version_3_6_8"></a>
<h3>2009 Jan 12 (3.6.8)</h3><p><ul>
<li>Added support for <a href="lang_savepoint.html">nested transactions</a></li>
<li>Enhanced the query optimizer so that it is able to use
    multiple indices to efficiently process 
    <a href="optoverview.html#or_opt">OR-connected constraints</a>
    in a WHERE clause.</li>
<li>Added support for parentheses in FTS3 query patterns using the
    <a href="compile.html#enable_fts3_parenthesis">SQLITE_ENABLE_FTS3_PARENTHESIS</a> compile-time option.</li>
</ul></p><a name="version_3_6_7"></a>
<h3>2008 Dec 16 (3.6.7)</h3><p><ul>
<li>Reorganize the Unix interface in os_unix.c</li>
<li>Added support for "Proxy Locking" on Mac OS X.</li>
<li>Changed the prototype of the <a href="c3ref/auto_extension.html">sqlite3_auto_extension()</a> interface in a
    way that is backwards compatible but which might cause warnings in new
    builds of applications that use that interface.</li>
<li>Changed the signature of the xDlSym method of the <a href="c3ref/vfs.html">sqlite3_vfs</a> object
    in a way that is backwards compatible but which might cause
    compiler warnings.</li>
<li>Added superfluous casts and variable initializations in order
    to suppress nuisance compiler warnings.</li>
<li>Fixes for various minor bugs.</li>
</ul></p><a name="version_3_6_6_2"></a>
<h3>2008 Nov 26 (3.6.6.2)</h3><p><ul>
<li>Fix a bug in the b-tree delete algorithm that seems like it might be
    able to cause database corruption.  The bug was first introduced in
    <a href="#version_3_6_6">version 3.6.6</a> by check-in &#91;5899&#93; on 2008-11-13.</li>
<li>Fix a memory leak that can occur following a disk I/O error.</li>
</ul></p><a name="version_3_6_6_1"></a>
<h3>2008 Nov 22 (3.6.6.1)</h3><p><ul>
<li>Fix a bug in the page cache that can lead database corruption following
    a rollback.  This bug was first introduced in <a href="#version_3_6_4">version 3.6.4</a>.</li>
<li>Two other very minor bug fixes</li>
</ul></p><a name="version_3_6_6"></a>
<h3>2008 Nov 19 (3.6.6)</h3><p><ul>
<li>Fix a #define that prevented <a href="malloc.html#memsys5">memsys5</a> from compiling</li>
<li>Fix a problem in the virtual table commit mechanism that was causing
    a crash in FTS3.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=3497">Ticket #3497</a>.</li>
<li>Add the <a href="c3ref/pcache_methods2.html">application-defined page cache</a></li>
<li>Added built-in support for VxWorks</li>
</ul></p><a name="version_3_6_5"></a>
<h3>2008 Nov 12 (3.6.5)</h3><p><ul>
<li>Add the MEMORY option to the <a href="pragma.html#pragma_journal_mode">journal_mode pragma</a>.</li>
<li>Added the <a href="c3ref/db_mutex.html">sqlite3_db_mutex()</a> interface.</li>
<li>Added the <a href="compile.html#omit_truncate_optimization">SQLITE_OMIT_TRUNCATE_OPTIMIZATION</a> compile-time option.</li>
<li>Fixed the <a href="lang_delete.html#truncateopt">truncate optimization</a> so that <a href="c3ref/changes.html">sqlite3_changes()</a> and
    <a href="c3ref/total_changes.html">sqlite3_total_changes()</a> interfaces and the <a href="pragma.html#pragma_count_changes">count_changes pragma</a>
    return the correct values.</li>
<li>Added the <a href="c3ref/errcode.html">sqlite3_extended_errcode()</a> interface.</li>
<li>The <a href="lang_transaction.html">COMMIT</a> command now succeeds even if there are pending queries.
    It returns <a href="c3ref/c_abort.html">SQLITE_BUSY</a> if there are pending incremental BLOB I/O requests.
<li>The error code is changed to <a href="c3ref/c_abort.html">SQLITE_BUSY</a> (instead of <a href="c3ref/c_abort.html">SQLITE_ERROR</a>)
    when an attempt is made to <a href="lang_transaction.html">ROLLBACK</a> while one or more queries are
    still pending.</li>
<li>Drop all support for the <a href="malloc.html#memsysx">experimental memory allocators</a> memsys4 and
    memsys6.</li>
<li>Added the <a href="compile.html#zero_malloc">SQLITE_ZERO_MALLOC</a> compile-time option.</li>
</ul></p><a name="version_3_6_4"></a>
<h3>2008 Oct 15 (3.6.4)</h3><p><ul>
<li>Add option support for LIMIT and ORDER BY clauses on <a href="lang_delete.html">DELETE</a> and
    <a href="lang_update.html">UPDATE</a> statements.  Only works if SQLite is compiled with
    <a href="compile.html#enable_update_delete_limit">SQLITE_ENABLE_UPDATE_DELETE_LIMIT</a>.
<li>Added the <a href="c3ref/stmt_status.html">sqlite3_stmt_status()</a> interface for performance monitoring.</li>
<li>Add the <a href="lang_indexedby.html">INDEXED BY</a> clause.</li>
<li>The LOCKING_STYLE extension is now enabled by default on Mac OS X</li>
<li>Added the TRUNCATE option to <a href="pragma.html#pragma_journal_mode">PRAGMA journal_mode</a></li>
<li>Performance enhancements to tree balancing logic in the B-Tree layer.</li>
<li>Added the
  <a href="http://www.sqlite.org/src/finfo?name=tool/genfkey.c">
  source code</a> and
  <a href="http://www.sqlite.org/src/finfo?name=tool/genfkey.README">
  documentation</a> for the <b>genfkey</b> program for automatically generating
  triggers to enforce foreign key constraints.</li>
<li>Added the <a href="compile.html#omit_truncate_optimization">SQLITE_OMIT_TRUNCATE_OPTIMIZATION</a> compile-time option.</li>
<li>The <a href="lang.html">SQL language documentation</a> is converted to use 
<a href="syntaxdiagrams.html">syntax diagrams</a> instead of BNF.</li>
<li>Other minor bug fixes</li>
</ul></p><a name="version_3_6_3"></a>
<h3>2008 Sep 22 (3.6.3)</h3><p><ul>
<li>Fix for a bug in the SELECT DISTINCT logic that was introduced by the
    prior version.</li>
<li>Other minor bug fixes</li>
</ul></p><a name="version_3_6_2"></a>
<h3>2008 Aug 30 (3.6.2)</h3><p><ul>
<li>Split the pager subsystem into separate pager and pcache subsystems.</li>
<li>Factor out identifier resolution procedures into separate files.</li>
<li>Bug fixes</li>
</ul></p><a name="version_3_6_1"></a>
<h3>2008 Aug 6 (3.6.1)</h3><p><ul>
<li>Added the <a href="malloc.html#lookaside">lookaside memory allocator</a> for a speed improvement in excess
    of 15% on some workloads.  (Your mileage may vary.)</li>
<li>Added the <a href="c3ref/c_config_getmalloc.html#sqliteconfiglookaside">SQLITE_CONFIG_LOOKASIDE</a> verb to <a href="c3ref/config.html">sqlite3_config()</a> to control
    the default lookaside configuration.</li>
<li>Added verbs <a href="c3ref/c_status_malloc_count.html#sqlitestatuspagecachesize">SQLITE_STATUS_PAGECACHE_SIZE</a> and
    <a href="c3ref/c_status_malloc_count.html#sqlitestatusscratchsize">SQLITE_STATUS_SCRATCH_SIZE</a> to the <a href="c3ref/status.html">sqlite3_status()</a> interface.
<li>Modified <a href="c3ref/c_config_getmalloc.html#sqliteconfigpagecache">SQLITE_CONFIG_PAGECACHE</a> and <a href="c3ref/c_config_getmalloc.html#sqliteconfigscratch">SQLITE_CONFIG_SCRATCH</a> to remove
    the "+4" magic number in the buffer size computation.
<li>Added the <a href="c3ref/db_config.html">sqlite3_db_config()</a> and <a href="c3ref/db_status.html">sqlite3_db_status()</a> interfaces for
    controlling and monitoring the lookaside allocator separately on each
    <a href="c3ref/sqlite3.html">database connection</a>.</li>
<li>Numerous other performance enhancements</li>
<li>Miscellaneous minor bug fixes</li>
</ul></p><h3>2008 July 16 (3.6.0 beta)</h3><p><ul>
<li>Modifications to the <a href="c3ref/vfs.html">virtual file system</a> interface
    to support a wider range of embedded systems.
    See <a href="35to36.html">35to36.html</a> for additional information.
    <font color="red">*** Potentially incompatible change ***</font></li>
<li>All C-preprocessor macros used to control compile-time options
    now begin with the prefix "SQLITE_".  This may require changes to
    applications that compile SQLite using their own makefiles and with
    custom compile-time options, hence we mark this as a
    <font color="red">*** Potentially incompatible change ***</font></li>
<li>The SQLITE_MUTEX_APPDEF compile-time option is no longer supported.
    Alternative mutex implementations can now be added at run-time using
    the <a href="c3ref/config.html">sqlite3_config()</a> interface with the <a href="c3ref/c_config_getmalloc.html#sqliteconfigmutex">SQLITE_CONFIG_MUTEX</a> verb.
    <font color="red">*** Potentially incompatible change ***</font></li>
<li>The handling of IN and NOT IN operators that contain a NULL on their
    right-hand side expression is brought into compliance with the SQL
    standard and with other SQL database engines.  This is a bug fix,
    but as it has the potential to break legacy applications that depend
    on the older buggy behavior, we mark that as a
    <font color="red">*** Potentially incompatible change ***</font></li>
<li>The result column names generated for compound subqueries have been 
    simplified to show only the name of the column of the original table and
    omit the table name.  This makes SQLite operate more like other SQL
    database engines.</li>
<li>Added the <a href="c3ref/config.html">sqlite3_config()</a> interface for doing run-time configuration
    of the entire SQLite library.</li>
<li>Added the <a href="c3ref/status.html">sqlite3_status()</a> interface used for querying run-time status
    information about the overall SQLite library and its subsystems.</li>
<li>Added the <a href="c3ref/initialize.html">sqlite3_initialize()</a> and <a href="c3ref/initialize.html">sqlite3_shutdown()</a> interfaces.</li>
<li>The <a href="c3ref/c_open_autoproxy.html">SQLITE_OPEN_NOMUTEX</a> option was added to <a href="c3ref/open.html">sqlite3_open_v2()</a>.</li>
<li>Added the <a href="pragma.html#pragma_page_count">PRAGMA page_count</a> command.</li>
<li>Added the <a href="c3ref/next_stmt.html">sqlite3_next_stmt()</a> interface.</li>
<li>Added a new <a href="rtree.html">R*Tree virtual table</a></li>
</ul></p><a name="version_3_5_9"></a>
<h3>2008 May 14 (3.5.9)</h3><p><ul>
<li>Added <em>experimental</em>
    support for the <a href="pragma.html#pragma_journal_mode">journal_mode</a> PRAGMA and persistent journal.</li>
<li><a href="pragma.html#pragma_journal_mode">Journal mode PERSIST</a> is the default behavior in
    <a href="pragma.html#pragma_locking_mode">exclusive locking mode</a>.</li>
<li>Fix a performance regression on LEFT JOIN (see <a href="http://www.sqlite.org/cvstrac/tktview?tn=3015">ticket #3015</a>)
    that was mistakenly introduced in <a href="#version_3_5_8">version 3.5.8</a>.</li>
<li>Performance enhancement: Reengineer the internal routines used
    to interpret and render variable-length integers.</li>
<li>Fix a buffer-overrun problem in <a href="c3ref/mprintf.html">sqlite3_mprintf()</a> which occurs
    when a string without a zero-terminator is passed to "%.*s".</li>
<li>Always convert IEEE floating point NaN values into NULL during
    processing.  (<a href="http://www.sqlite.org/cvstrac/tktview?tn=3060">Ticket #3060</a>)</li>
<li>Make sure that when a connection blocks on a RESERVED lock that
    it is able to continue after the lock is released.  (<a href="http://www.sqlite.org/cvstrac/tktview?tn=3093">Ticket #3093</a>)</li>
<li>The "configure" scripts should now automatically configure Unix
    systems for large file support.  Improved error messages for
    when large files are encountered and large file support is disabled.</li>
<li>Avoid cache pages leaks following disk-full or I/O errors</li>
<li>And, many more minor bug fixes and performance enhancements....</li>
</ul></p><a name="version_3_5_8"></a>
<h3>2008 Apr 16 (3.5.8)</h3><p><ul>
<li>Expose SQLite's internal pseudo-random number generator (PRNG)
    via the <a href="c3ref/randomness.html">sqlite3_randomness()</a> interface</li>
<li>New interface <a href="c3ref/context_db_handle.html">sqlite3_context_db_handle()</a> that returns the
    <a href="c3ref/sqlite3.html">database connection</a> handle that has invoked an application-defined
    SQL function.</li>
<li>New interface <a href="c3ref/limit.html">sqlite3_limit()</a> allows size and length limits to be
    set on a per-connection basis and at run-time.</li>
<li>Improved crash-robustness: write the database page size into the rollback
    journal header.</li>
<li>Allow the <a href="lang_vacuum.html">VACUUM</a> command to change the page size of a database file.</li>
<li>The xAccess() method of the VFS is allowed to return -1 to signal
    a memory allocation error.</li>
<li>Performance improvement: The OP_IdxDelete opcode uses unpacked records,
    obviating the need for one OP_MakeRecord opcode call for each index
    record deleted.</li>
<li>Performance improvement: Constant subexpressions are factored out of
    loops.</li>
<li>Performance improvement: Results of OP_Column are reused rather than
    issuing multiple OP_Column opcodes.</li>
<li>Fix a bug in the RTRIM collating sequence.</li>
<li>Fix a bug in the SQLITE_SECURE_DELETE option that was causing
    Firefox crashes.  Make arrangements to always test SQLITE_SECURE_DELETE
    prior to each release.</li>
<li>Other miscellaneous performance enhancements.</li>
<li>Other miscellaneous minor bug fixes.</li>
</ul></p><a name="version_3_5_7"></a>
<h3>2008 Mar 17 (3.5.7)</h3><p><ul>
<li>Fix a bug (<a href="http://www.sqlite.org/cvstrac/tktview?tn=2927">ticket #2927</a>) in the register allocation for
compound selects - introduced by the new VM code in version 3.5.5.</li>
<li>ALTER TABLE uses double-quotes instead of single-quotes for quoting
filenames.</li>
<li>Use the WHERE clause to reduce the size of a materialized VIEW in
an UPDATE or DELETE statement. (Optimization)</li>
<li>Do not apply the flattening optimization if the outer query is an
aggregate and the inner query contains ORDER BY.  (<a href="http://www.sqlite.org/cvstrac/tktview?tn=2943">Ticket #2943</a>)</li>
<li>Additional OS/2 updates</li>
<li>Added an experimental power-of-two, first-fit memory allocator.</li>
<li>Remove all instances of sprintf() from the code</li>
<li>Accept "Z" as the zulu timezone at the end of date strings</li>
<li>Fix a bug in the LIKE optimizer that occurs when the last character
before the first wildcard is an upper-case "Z"</li>
<li>Added the "bitvec" object for keeping track of which pages have
been journalled.  Improves speed and reduces memory consumption, especially
for large database files.</li>
<li>Get the SQLITE_ENABLE_LOCKING_STYLE macro working again on Mac OS X.</li>
<li>Store the statement journal in the temporary file directory instead of
collocated with the database file.</li>
<li>Many improvements and cleanups to the configure script</li>
</ul></p><a name="version_3_5_6"></a>
<h3>2008 Feb 6 (3.5.6)</h3><p><ul>
<li>Fix a bug (<a href="http://www.sqlite.org/cvstrac/tktview?tn=2913">ticket #2913</a>)
that prevented virtual tables from working in a LEFT JOIN.
The problem was introduced into shortly before the 3.5.5 release.</li>
<li>Bring the OS/2 porting layer up-to-date.</li>
<li>Add the new <a href="c3ref/result_blob.html">sqlite3_result_error_code()</a> API and use it in the
implementation of <a href="lang_attach.html">ATTACH</a> so that proper error codes are returned
when an <a href="lang_attach.html">ATTACH</a> fails.</li>
</ul></p><a name="version_3_5_5"></a>
<h3>2008 Jan 31 (3.5.5)</h3><p><ul>
<li>Convert the underlying virtual machine to be a register-based machine
rather than a stack-based machine.  The only user-visible change
is in the output of EXPLAIN.</li>
<li>Add the build-in RTRIM collating sequence.</li>
</ul></p><a name="version_3_5_4"></a>
<h3>2007 Dec 14 (3.5.4)</h3><p><ul>
<li>Fix a critical bug in UPDATE or DELETE that occurs when an
OR REPLACE clause or a trigger causes rows in the same table to
be deleted as side effects.  (See <a href="http://www.sqlite.org/cvstrac/tktview?tn=2832">ticket #2832</a>.)  The most likely
result of this bug is a segmentation fault, though database
corruption is a possibility.</li>
<li>Bring the processing of ORDER BY into compliance with the 
SQL standard for case where a result alias and a table column name
are in conflict.  Correct behavior is to prefer the result alias.
Older versions of SQLite incorrectly picked the table column.
(See <a href="http://www.sqlite.org/cvstrac/tktview?tn=2822">ticket #2822</a>.)</li>
<li>The <a href="lang_vacuum.html">VACUUM</a> command preserves
the setting of the 
<a href="pragma.html#pragma_legacy_file_format">legacy_file_format pragma</a>.
(<a href="http://www.sqlite.org/cvstrac/tktview?tn=2804">Ticket #2804</a>.)</li>
<li>Productize and officially support the group_concat() SQL function.</li>
<li>Better optimization of some IN operator expressions.</li>
<li>Add the ability to change the 
<a href="pragma.html#pragma_auto_vacuum">auto_vacuum</a> status of a
database by setting the auto_vaccum pragma and VACUUMing the database.</li>
<li>Prefix search in FTS3 is much more efficient.</li>
<li>Relax the SQL statement length restriction in the CLI so that
the ".dump" output of databases with very large BLOBs and strings can
be played back to recreate the database.</li>
<li>Other small bug fixes and optimizations.</li>
</ul></p><a name="version_3_5_3"></a>
<h3>2007 Nov 27 (3.5.3)</h3><p><ul>
<li>Move website and documentation files out of the source tree into
a <a href="http://www.sqlite.org/docsrc/">separate CM system</a>.
<li>Fix a long-standing bug in INSERT INTO ... SELECT ... statements
where the SELECT is compound.
<li>Fix a long-standing bug in RAISE(IGNORE) as used in BEFORE triggers.
<li>Fixed the operator precedence for the ~ operator.
<li>On Win32, do not return an error when attempting to delete a file
that does not exist.
<li>Allow collating sequence names to be quoted.
<li>Modify the TCL interface to use <a href="c3ref/prepare.html">sqlite3_prepare_v2()</a>.
<li>Fix multiple bugs that can occur following a malloc() failure.
<li><a href="c3ref/step.html">sqlite3_step()</a> returns <a href="c3ref/c_abort.html">SQLITE_MISUSE</a> instead of crashing when
called with a NULL parameter.
<li>FTS3 now uses the SQLite memory allocator exclusively.  The
FTS3 amalgamation can now be appended to the SQLite amalgamation to
generate a super-amalgamation containing both.
<li>The DISTINCT keyword now will sometimes use an INDEX if an
appropriate index is available and the optimizer thinks its use
might be advantageous.
</ul></p><a name="version_3_5_2"></a>
<h3>2007 Nov 05 (3.5.2)</h3><p><ul>
<li>Dropped support for the <a href="compile.html#omitfeatures">SQLITE_OMIT_MEMORY_ALLOCATION</a> compile-time
option.
<li>Always open files using FILE_FLAG_RANDOM_ACCESS under Windows.
<li>The 3rd parameter of the built-in SUBSTR() function is now optional.
<li>Bug fix: do not invoke the authorizer when reparsing the schema after
a schema change.
<li>Added the experimental malloc-free memory allocator in mem3.c.
<li>Virtual machine stores 64-bit integer and floating point constants
in binary instead of text for a performance boost.
<li>Fix a race condition in test_async.c.
<li>Added the ".timer" command to the CLI
</ul></p><a name="version_3_5_1"></a>
<h3>2007 Oct 04 (3.5.1)</h3><p><ul>
<li><i><b>Nota Bene:</b> We are not using terms "alpha" or "beta" on this
    release because the code is stable and because if we use those terms,
    nobody will upgrade.  However, we still reserve the right to make
    incompatible changes to the new VFS interface in future releases.</i></li>

<li>Fix a bug in the handling of <a href="c3ref/c_abort.html">SQLITE_FULL</a> errors that could lead
    to database corruption.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2686">Ticket #2686</a>.
<li>The test_async.c drive now does full file locking and works correctly
    when used simultaneously by multiple processes on the same database.
<li>The CLI ignores whitespace (including comments) at the end of lines
<li>Make sure the query optimizer checks dependencies on all terms of
    a compound SELECT statement.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2640">Ticket #2640</a>.
<li>Add demonstration code showing how to build a VFS for a raw
    mass storage without a filesystem.
<li>Added an output buffer size parameter to the xGetTempname() method
    of the VFS layer.
<li>Sticky <a href="c3ref/c_abort.html">SQLITE_FULL</a> or <a href="c3ref/c_abort.html">SQLITE_IOERR</a> errors in the pager are reset
    when a new transaction is started.
</ul></p><a name="version_3_5_0"></a>
<h3>2007 Sep 04 (3.5.0) alpha</h3><p><ul>
<li>Redesign the OS interface layer.  See
    <a href="34to35.html">34to35.html</a> for details.
    <font color="red">*** Potentially incompatible change ***</font>
<li>The <a href="c3ref/release_memory.html">sqlite3_release_memory()</a>, <a href="c3ref/soft_heap_limit.html">sqlite3_soft_heap_limit()</a>,
    and <a href="c3ref/enable_shared_cache.html">sqlite3_enable_shared_cache()</a> interfaces now work cross all
    threads in the process, not just the single thread in which they
    are invoked.
    <font color="red">*** Potentially incompatible change ***</font>
<li>Added the <a href="c3ref/open.html">sqlite3_open_v2()</a> interface.  
<li>Reimplemented the memory allocation subsystem and made it 
    replaceable at compile-time.
<li>Created a new mutex subsystem and made it replicable at
    compile-time.
<li>The same database connection may now be used simultaneously by
    separate threads.
</ul></p><a name="version_3_4_2"></a>
<h3>2007 August 13 (3.4.2)</h3><p><ul>
<li>Fix a database corruption bug that might occur if a ROLLBACK command
is executed in <a href="pragma.html#pragma_auto_vacuum">auto-vacuum mode</a>
and a very small <a href="c3ref/soft_heap_limit.html">sqlite3_soft_heap_limit</a> is set. 
<a href="http://www.sqlite.org/cvstrac/tktview?tn=2565">Ticket #2565</a>.

<li>Add the ability to run a full regression test with a small
<a href="c3ref/soft_heap_limit.html">sqlite3_soft_heap_limit</a>.

<li>Fix other minor problems with using small soft heap limits.

<li>Work-around for 
<a href="http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32575">GCC bug 32575</a>.

<li>Improved error detection of misused aggregate functions.

<li>Improvements to the amalgamation generator script so that all symbols
are prefixed with either SQLITE_PRIVATE or SQLITE_API.
</ul></p><a name="version_3_4_1"></a>
<h3>2007 July 20 (3.4.1)</h3><p><ul>
<li>Fix a bug in <a href="lang_vacuum.html">VACUUM</a> that can lead to
    <a href="http://www.sqlite.org/cvstrac/wiki?p=DatabaseCorruption">
    database corruption</a> if two
    processes are connected to the database at the same time and one
    VACUUMs then the other then modifies the database.</li>
<li>The expression "+column" is now considered the same as "column"
    when computing the collating sequence to use on the expression.</li>
<li>In the <a href="tclsqlite.html">TCL language interface</a>,
   "@variable" instead of "$variable" always binds as a blob.</li>
<li>Added <a href="pragma.html#pragma_freelist_count">PRAGMA freelist_count</a>
    for determining the current size of the freelist.</li>
<li>The <a href="pragma.html#pragma_auto_vacuum">
    PRAGMA auto_vacuum=incremental</a> setting is now persistent.</li>
<li>Add FD_CLOEXEC to all open files under Unix.</li>
<li>Fix a bug in the <a href="optoverview.html#minmax">
    min()/max() optimization</a> when applied to
    descending indices.</li>
<li>Make sure the TCL language interface works correctly with 64-bit
    integers on 64-bit machines.</li>
<li>Allow the value -9223372036854775808 as an integer literal in SQL
    statements.</li>
<li>Add the capability of "hidden" columns in virtual tables.</li>
<li>Use the macro SQLITE_PRIVATE (defaulting to "static") on all
    internal functions in the amalgamation.</li>
<li>Add pluggable tokenizers and <a href="http://www.icu-project.org/">ICU</a>
    tokenization support to FTS2</li>
<li>Other minor bug fixes and documentation enhancements</li>
</ul></p><a name="version_3_4_0"></a>
<h3>2007 June 18 (3.4.0)</h3><p><ul>
<li>Fix a bug that can lead to database corruption if an <a href="c3ref/c_abort.html">SQLITE_BUSY</a> error
    occurs in the middle of an explicit transaction and that transaction
    is later committed.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2409">Ticket #2409</a>.
    See the
    <a href="http://www.sqlite.org/cvstrac/wiki?p=CorruptionFollowingBusyError">
    CorruptionFollowingBusyError</a> wiki page for details.</i>
<li>Fix a bug that can lead to database corruption if autovacuum mode is
    on and a malloc() failure follows a CREATE TABLE or CREATE INDEX statement
    which itself follows a cache overflow inside a transaction.  See
    <a href="http://www.sqlite.org/cvstrac/tktview?tn=2418">ticket #2418</a>. 
    </li>
<li>Added explicit <a href="limits.html">upper bounds</a> on the sizes and
    quantities of things SQLite can process.  This change might cause
    compatibility problems for
    applications that use SQLite in the extreme, which is why the current
    release is 3.4.0 instead of 3.3.18.</li>
<li>Added support for <a href="c3ref/blob_open.html">Incremental BLOB I/O</a>.</li>
<li>Added the <a href="c3ref/bind_blob.html">sqlite3_bind_zeroblob()</a> API</a>
    and the <a href="lang_expr.html#zeroblob">zeroblob()</a> SQL function.</li>
<li>Added support for <a href="pragma.html#pragma_incremental_vacuum">
    Incremental Vacuum</a>.</li>
<li>Added the SQLITE_MIXED_ENDIAN_64BIT_FLOAT compile-time option to support
    ARM7 processors with goofy endianness.</li>
<li>Removed all instances of sprintf() and strcpy() from the core library.</li>
<li>Added support for
    <a href="http://www.icu-project.org/">International Components for Unicode (ICU)</a>
    to the full-text search extensions.
</ul><p>
<ul type="circle">
<li>In the Windows OS driver, reacquire a SHARED lock if an attempt to
    acquire an EXCLUSIVE lock fails.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2354">Ticket #2354</a></li>
<li>Fix the REPLACE() function so that it returns NULL if the second argument
    is an empty string.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2324">Ticket #2324</a>.</li>
<li>Document the hazards of type conversions in
    <a href="c3ref/column_blob.html">sqlite3_column_blob()</a>
    and related APIs.  Fix unnecessary type conversions.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2321">Ticket #2321</a>.</li>
<li>Internationalization of the TRIM() function.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2323">Ticket #2323</a></li>
<li>Use memmove() instead of memcpy() when moving between memory regions
    that might overlap.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2334">Ticket #2334</a></li>
<li>Fix an optimizer bug involving subqueries in a compound SELECT that has
    both an ORDER BY and a LIMIT clause.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2339">Ticket #2339</a>.</li>
<li>Make sure the <a href="c3ref/mprintf.html">sqlite3_snprintf()</a>
    interface does not zero-terminate the buffer if the buffer size is
    less than 1.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2341">Ticket #2341</a></li>
<li>Fix the built-in printf logic so that it prints "NaN" not "Inf" for
    floating-point NaNs.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2345">Ticket #2345</a></li>
<li>When converting BLOB to TEXT, use the text encoding of the main database.
    <a href="http://www.sqlite.org/cvstrac/tktview?tn=2349">Ticket #2349</a></li>
<li>Keep the full precision of integers (if possible) when casting to
    NUMERIC.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2364">Ticket #2364</a></li>
<li>Fix a bug in the handling of UTF16 codepoint 0xE000</li>
<li>Consider explicit collate clauses when matching WHERE constraints
    to indices in the query optimizer.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2391">Ticket #2391</a></li>
<li>Fix the query optimizer to correctly handle constant expressions in 
    the ON clause of a LEFT JOIN.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2403">Ticket #2403</a></li>
<li>Fix the query optimizer to handle rowid comparisons to NULL
    correctly.  <a href="http://www.sqlite.org/cvstrac/tktview?tn=2404">Ticket #2404</a></li>
<li>Fix many potential segfaults that could be caused by malicious SQL
    statements.</li>
</ul></p><a name="version_3_3_17"></a>
<h3>2007 April 25 (3.3.17)</h3><p><ul>
<li>When the "write_version" value of the database header is larger than
    what the library understands, make the database read-only instead of
    unreadable.</li>
<li>Other minor bug fixes</li>
</ul></p><a name="version_3_3_16"></a>
<h3>2007 April 18 (3.3.16)</h3><p><ul>
<li>Fix a bug that caused VACUUM to fail if NULLs appeared in a
    UNIQUE column.</li>
<li>Reinstate performance improvements that were added in
    <a href="#version_3_3_14">Version 3.3.14</a>
    but regressed in <a href="#version_3_3_15">Version 3.3.15</a>.</li>
<li>Fix problems with the handling of ORDER BY expressions on
    compound SELECT statements in subqueries.</li>
<li>Fix a potential segfault when destroying locks on WinCE in
    a multi-threaded environment.</li>
<li>Documentation updates.</li>
</ul></p><a name="version_3_3_15"></a>
<h3>2007 April 9 (3.3.15)</h3><p><ul>
<li>Fix a bug introduced in 3.3.14 that caused a rollback of
    CREATE TEMP TABLE to leave the database connection wedged.</li>
<li>Fix a bug that caused an extra NULL row to be returned when
    a descending query was interrupted by a change to the database.</li>
<li>The FOR EACH STATEMENT clause on a trigger now causes a syntax
    error.  It used to be silently ignored.</li>
<li>Fix an obscure and relatively harmless problem that might have caused
    a resource leak following an I/O error.</li>
<li>Many improvements to the test suite.  Test coverage now exceeded 98%</li>
</ul></p><a name="version_3_3_14"></a>
<h3>2007 April 2 (3.3.14)</h3><p><ul>
<li>Fix a bug (<a href="http://www.sqlite.org/cvstrac/tktview?tn=2273">ticket #2273</a>)
    that could cause a segfault when the IN operator
    is used one one term of a two-column index and the right-hand side of
    the IN operator contains a NULL.</li>
<li>Added a new OS interface method for determining the sector size
    of underlying media:  sqlite3OsSectorSize().</li>
<li>A new algorithm for statements of the form
    INSERT INTO <i>table1</i> SELECT * FROM <i>table2</i>
    is faster and reduces fragmentation.  VACUUM uses statements of
    this form and thus runs faster and defragments better.</li>
<li>Performance enhancements through reductions in disk I/O:
<ul>
<li>Do not read the last page of an overflow chain when
    deleting the row - just add that page to the freelist.</li>
<li>Do not store pages being deleted in the 
    rollback journal.</li>
<li>Do not read in the (meaningless) content of
    pages extracted from the freelist.</li>
<li>Do not flush the page cache (and thus avoiding
    a cache refill) unless another process changes the underlying
    database file.</li>
<li>Truncate rather than delete the rollback journal when committing
    a transaction in exclusive access mode, or when committing the TEMP
    database.</li>
</ul></li>
<li>Added support for exclusive access mode using
    <a href="pragma.html#pragma_locking_mode">
    "PRAGMA locking_mode=EXCLUSIVE"</a></li>
<li>Use heap space instead of stack space for large buffers in the
    pager - useful on embedded platforms with  stack-space
    limitations.</li>
<li>Add a makefile target "sqlite3.c" that builds an amalgamation containing
    the core SQLite library C code in a single file.</li>
<li>Get the library working correctly when compiled 
    with GCC option "-fstrict-aliasing".</li>
<li>Removed the vestigal SQLITE_PROTOCOL error.</li>
<li>Improvements to test coverage, other minor bugs fixed,
    memory leaks plugged,
    code refactored and/or recommended in places for easier reading.</li>
</ul></p><a name="version_3_3_13"></a>
<h3>2007 February 13 (3.3.13)</h3><p><ul>
<li>Add a "fragmentation" measurement in the output of sqlite3_analyzer.</li>
<li>Add the COLLATE operator used to explicitly set the collating sequence
used by an expression.  This feature is considered experimental pending
additional testing.</li>
<li>Allow up to 64 tables in a join - the old limit was 32.</li>
<li>Added two new experimental functions:
<a href="lang_expr.html#randomblobFunc">randomBlob()</a> and
<a href="lang_expr.html#hexFunc">hex()</a>.
Their intended use is to facilitate generating 
<a href="http://en.wikipedia.org/wiki/UUID">UUIDs</a>.
</li>
<li>Fix a problem where
<a href="pragma.html#pragma_count_changes">PRAGMA count_changes</a> was
causing incorrect results for updates on tables with triggers</li>
<li>Fix a bug in the ORDER BY clause optimizer for joins where the
left-most table in the join is constrained by a UNIQUE index.</li>
<li>Fixed a bug in the "copy" method of the TCL interface.</li>
<li>Bug fixes in fts1 and fts2 modules.</li>
</ul></p><a name="version_3_3_12"></a>
<h3>2007 January 27 (3.3.12)</h3><p><ul>
<li>Fix another bug in the IS NULL optimization that was added in
version 3.3.9.</li>
<li>Fix an assertion fault that occurred on deeply nested views.</li>
<li>Limit the amount of output that
<a href="pragma.html#pragma_integrity_check">PRAGMA integrity_check</a>
generates.</li>
<li>Minor syntactic changes to support a wider variety of compilers.</li>
</ul></p><a name="version_3_3_11"></a>
<h3>2007 January 22 (3.3.11)</h3><p><ul>
<li>Fix another bug in the implementation of the new 
<a href="c3ref/prepare.html">sqlite3_prepare_v2()</a> API.
We'll get it right eventually...</li>
<li>Fix a bug in the IS NULL optimization that was added in version 3.3.9 -
the bug was causing incorrect results on certain LEFT JOINs that included
in the WHERE clause an IS NULL constraint for the right table of the
LEFT JOIN.</li>
<li>Make AreFileApisANSI() a no-op macro in WinCE since WinCE does not
support this function.</li>
</ul></p><a name="version_3_3_10"></a>
<h3>2007 January 9 (3.3.10)</h3><p><ul>
<li>Fix bugs in the implementation of the new 
<a href="c3ref/prepare.html">sqlite3_prepare_v2()</a> API
that can lead to segfaults.</li>
<li>Fix 1-second round-off errors in the 
<a href="http://www.sqlite.org/cvstrac/wiki?p=DateAndTimeFunctions">
strftime()</a> function</li>
<li>Enhance the Windows OS layer to provide detailed error codes</li>
<li>Work around a win2k problem so that SQLite can use single-character
database file names</li>
<li>The
<a href="pragma.html#pragma_user_version">user_version</a> and
<a href="pragma.html#pragma_schema_version">schema_version</a> pragmas 
correctly set their column names in the result set</li>
<li>Documentation updates</li>
</ul></p><a name="version_3_3_9"></a>
<h3>2007 January 4 (3.3.9)</h3><p><ul>
<li>Fix bugs in pager.c that could lead to database corruption if two
processes both try to recover a hot journal at the same instant</li>
<li>Added the <a href="c3ref/prepare.html">sqlite3_prepare_v2()</a>
API.</li>
<li>Fixed the ".dump" command in the command-line shell to show
indices, triggers and views again.</li>
<li>Change the table_info pragma so that it returns NULL for the default
value if there is no default value</li>
<li>Support for non-ASCII characters in win95 filenames</li>
<li>Query optimizer enhancements:
<ul>
<li>Optimizer does a better job of using indices to satisfy ORDER BY
clauses that sort on the integer primary key</li>
<li>Use an index to satisfy an IS NULL operator in the WHERE clause</li>
<li>Fix a bug that was causing the optimizer to miss an OR optimization
opportunity</li>
<li>The optimizer has more freedom to reorder tables in the FROM clause
even in there are LEFT joins.</li>
</ul>
<li>Extension loading supported added to WinCE</li>
<li>Allow constraint names on the DEFAULT clause in a table definition</li>
<li>Added the ".bail" command to the command-line shell</li>
<li>Make CSV (comma separate value) output from the command-line shell
more closely aligned to accepted practice</li>
<li>Experimental FTS2 module added</li>
<li>Use sqlite3_mprintf() instead of strdup() to avoid libc dependencies</li>
<li>VACUUM uses a temporary file in the official TEMP folder, not in the
same directory as the original database</li>
<li>The prefix on temporary filenames on Windows is changed from "sqlite"
to "etilqs".</li>
</ul></p><a name="version_3_3_8"></a>
<h3>2006 October 9 (3.3.8)</h3><p><ul>
<li>Support for full text search using the
<a href="http://www.sqlite.org/cvstrac/wiki?p=FullTextIndex">FTS1 module</a>
(beta)</li>
<li>Added Mac OS X locking patches (beta - disabled by default)</li>
<li>Introduce extended error codes and add error codes for various
kinds of I/O errors.</li>
<li>Added support for IF EXISTS on CREATE/DROP TRIGGER/VIEW</li>
<li>Fix the regression test suite so that it works with Tcl8.5</li>
<li>Enhance sqlite3_set_authorizer() to provide notification of calls to
    SQL functions.</li>
<li>Added experimental API:  sqlite3_auto_extension()</li>
<li>Various minor bug fixes</li>
</ul></p><a name="version_3_3_7"></a>
<h3>2006 August 12 (3.3.7)</h3><p><ul>
<li>Added support for
<a href="http://www.sqlite.org/cvstrac/wiki?p=VirtualTables">virtual tables</a>
(beta)</li>
<li>Added support for 
<a href="http://www.sqlite.org/cvstrac/wiki?p=LoadableExtensions">
dynamically loaded extensions</a> (beta)</li>
<li>The 
<a href="c3ref/interrupt.html">sqlite3_interrupt()</a>
routine can be called for a different thread</li>
<li>Added the <a href="lang_expr.html#match">MATCH</a> operator.</li>
<li>The default file format is now 1.  
</ul></p><a name="version_3_3_6"></a>
<h3>2006 June 6 (3.3.6)</h3><p><ul>
<li>Plays better with virus scanners on Windows</li>
<li>Faster :memory: databases</li>
<li>Fix an obscure segfault in UTF-8 to UTF-16 conversions</li>
<li>Added driver for OS/2</li>
<li>Correct column meta-information returned for aggregate queries</li>
<li>Enhanced output from EXPLAIN QUERY PLAN</li>
<li>LIMIT 0 now works on subqueries</li>
<li>Bug fixes and performance enhancements in the query optimizer</li>
<li>Correctly handle NULL filenames in ATTACH and DETACH</li>
<li>Improved syntax error messages in the parser</li>
<li>Fix type coercion rules for the IN operator</li>
</ul></p><a name="version_3_3_5"></a>
<h3>2006 April 5 (3.3.5)</h3><p><ul>
<li>CHECK constraints use conflict resolution algorithms correctly.</li>
<li>The SUM() function throws an error on integer overflow.</li>
<li>Choose the column names in a compound query from the left-most SELECT
    instead of the right-most.</li>
<li>The sqlite3_create_collation() function
    honors the SQLITE_UTF16_ALIGNED flag.</li>
<li>SQLITE_SECURE_DELETE compile-time option causes deletes to overwrite
    old data with zeros.</li>
<li>Detect integer overflow in abs().</li>
<li>The random() function provides 64 bits of randomness instead of
    only 32 bits.</li>
<li>Parser detects and reports automaton stack overflow.</li>
<li>Change the round() function to return REAL instead of TEXT.</li>
<li>Allow WHERE clause terms on the left table of a LEFT OUTER JOIN to
    contain aggregate subqueries.</li>
<li>Skip over leading spaces in text to numeric conversions.</li>
<li>Various minor bug and documentation typo fixes and
    performance enhancements.</li>
</ul></p><a name="version_3_3_4"></a>
<h3>2006 February 11 (3.3.4)</h3><p><ul>
<li>Fix a blunder in the Unix mutex implementation that can lead to
deadlock on multithreaded systems.</li>
<li>Fix an alignment problem on 64-bit machines</li>
<li>Added the fullfsync pragma.</li>
<li>Fix an optimizer bug that could have caused some unusual LEFT OUTER JOINs
to give incorrect results.</li>
<li>The SUM function detects integer overflow and converts to accumulating
an approximate result using floating point numbers</li>
<li>Host parameter names can begin with '@' for compatibility with SQL Server.
</li>
<li>Other miscellaneous bug fixes</li>
</ul></p><a name="version_3_3_3"></a>
<h3>2006 January 31 (3.3.3)</h3><p><ul>
<li>Removed support for an ON CONFLICT clause on CREATE INDEX - it never
worked correctly so this should not present any backward compatibility
problems.</li>
<li>Authorizer callback now notified of ALTER TABLE ADD COLUMN commands</li>
<li>After any changes to the TEMP database schema, all prepared statements
are invalidated and must be recreated using a new call to
sqlite3_prepare()</li>
<li>Other minor bug fixes in preparation for the first stable release
of version 3.3</li>
</ul></p><h3>2006 January 24 (3.3.2 beta)</h3><p><ul>
<li>Bug fixes and speed improvements.  Improved test coverage.</li>
<li>Changes to the OS-layer interface: mutexes must now be recursive.</li>
<li>Discontinue the use of thread-specific data for out-of-memory
exception handling</li>
</ul></p><h3>2006 January 16 (3.3.1 alpha)</h3><p><ul>
<li>Countless bug fixes</li>
<li>Speed improvements</li>
<li>Database connections can now be used by multiple threads, not just
the thread in which they were created.</li>
</ul></p><h3>2006 January 10 (3.3.0 alpha)</h3><p><ul>
<li>CHECK constraints</li>
<li>IF EXISTS and IF NOT EXISTS clauses on CREATE/DROP TABLE/INDEX.</li>
<li>DESC indices</li>
<li>More efficient encoding of boolean values resulting in smaller database
files</li>
<li>More aggressive <a href="compile.html#omit_floating_point">SQLITE_OMIT_FLOATING_POINT</a></li>
<li>Separate INTEGER and REAL affinity</li>
<li>Added a virtual function layer for the OS interface</li>
<li>"exists" method added to the TCL interface</li>
<li>Improved response to out-of-memory errors</li>
<li>Database cache can be optionally shared between connections
in the same thread</li>
<li>Optional READ UNCOMMITTED isolation (instead of the default
isolation level of SERIALIZABLE) and table level locking when
database connections share a common cache.</li>
</ul></p><a name="version_3_2_8"></a>
<h3>2005 December 19 (3.2.8)</h3><p><ul>
<li>Fix an obscure bug that can cause database corruption under the
following unusual circumstances: A large INSERT or UPDATE statement which 
is part of an even larger transaction fails due to a uniqueness constraint
but the containing transaction commits.</li>
</ul></p><a name="version_2_8_17"></a>
<h3>2005 December 19 (2.8.17)</h3><p><ul>
<li>Fix an obscure bug that can cause database corruption under the
following unusual circumstances: A large INSERT or UPDATE statement which 
is part of an even larger transaction fails due to a uniqueness contraint
but the containing transaction commits.</li>
</ul></p><a name="version_3_2_7"></a>
<h3>2005 September 24 (3.2.7)</h3><p><ul>
<li>GROUP BY now considers NULLs to be equal again, as it should
</li>
<li>Now compiles on Solaris and OpenBSD and other Unix variants
that lack the fdatasync() function</li>
<li>Now compiles on MSVC++6 again</li>
<li>Fix uninitialized variables causing malfunctions for various obscure
queries</li>
<li>Correctly compute a LEFT OUTER JOINs that is constrained on the
left table only</li>
</ul></p><a name="version_3_2_6"></a>
<h3>2005 September 17 (3.2.6)</h3><p><ul>
<li>Fix a bug that can cause database corruption if a VACUUM (or
    autovacuum) fails and is rolled back on a database that is
    larger than 1GiB</li>
<li>LIKE optimization now works for columns with COLLATE NOCASE</li>
<li>ORDER BY and GROUP BY now use bounded memory</li>
<li>Added support for COUNT(DISTINCT expr)</li>
<li>Change the way SUM() handles NULL values in order to comply with
    the SQL standard</li>
<li>Use fdatasync() instead of fsync() where possible in order to speed
    up commits slightly</li>
<li>Use of the CROSS keyword in a join turns off the table reordering
    optimization</li>
<li>Added the experimental and undocumented EXPLAIN QUERY PLAN capability</li>
<li>Use the unicode API in Windows</li>
</ul></p><a name="version_3_2_5"></a>
<h3>2005 August 27 (3.2.5)</h3><p><ul>
<li>Fix a bug effecting DELETE and UPDATE statements that changed
more than 40960 rows.</li>
<li>Change the makefile so that it no longer requires GNUmake extensions</li>
<li>Fix the --enable-threadsafe option on the configure script</li>
<li>Fix a code generator bug that occurs when the left-hand side of an IN
operator is constant and the right-hand side is a SELECT statement</li>
<li>The PRAGMA synchronous=off statement now disables syncing of the
master journal file in addition to the normal rollback journals</li>
</ul></p><a name="version_3_2_4"></a>
<h3>2005 August 24 (3.2.4)</h3><p><ul>
<li>Fix a bug introduced in the previous release
that can cause a segfault while generating code
for complex WHERE clauses.</li>
<li>Allow floating point literals to begin or end with a decimal point.</li>
</ul></p><a name="version_3_2_3"></a>
<h3>2005 August 21 (3.2.3)</h3><p><ul>
<li>Added support for the CAST operator</li>
<li>Tcl interface allows BLOB values to be transferred to user-defined
functions</li>
<li>Added the "transaction" method to the Tcl interface</li>
<li>Allow the DEFAULT value of a column to call functions that have constant
operands</li>
<li>Added the ANALYZE command for gathering statistics on indices and
using those statistics when picking an index in the optimizer</li>
<li>Remove the limit (formerly 100) on the number of terms in the
WHERE clause</li>
<li>The right-hand side of the IN operator can now be a list of expressions
instead of just a list of constants</li>
<li>Rework the optimizer so that it is able to make better use of indices</li>
<li>The order of tables in a join is adjusted automatically to make
better use of indices</li>
<li>The IN operator is now a candidate for optimization even if the left-hand
side is not the left-most term of the index.  Multiple IN operators can be
used with the same index.</li>
<li>WHERE clause expressions using BETWEEN and OR are now candidates
for optimization</li>
<li>Added the "case_sensitive_like" pragma and the SQLITE_CASE_SENSITIVE_LIKE
compile-time option to set its default value to "on".</li>
<li>Use indices to help with GLOB expressions and LIKE expressions too
when the case_sensitive_like pragma is enabled</li>
<li>Added support for grave-accent quoting for compatibility with MySQL</li>
<li>Improved test coverage</li>
<li>Dozens of minor bug fixes</li>
</ul></p><a name="version_3_2_2"></a>
<h3>2005 June 13 (3.2.2)</h3><p><ul>
<li>Added the sqlite3_db_handle() API</li>
<li>Added the sqlite3_get_autocommit() API</li>
<li>Added a REGEXP operator to the parser.  There is no function to back
up this operator in the standard build but users can add their own using
sqlite3_create_function()</li>
<li>Speed improvements and library footprint reductions.</li>
<li>Fix byte alignment problems on 64-bit architectures.</li>
<li>Many, many minor bug fixes and documentation updates.</li>
</ul></p><a name="version_3_2_1"></a>
<h3>2005 March 29 (3.2.1)</h3><p><ul>
<li>Fix a memory allocation error in the new ADD COLUMN comment.</li>
<li>Documentation updates</li>
</ul></p><a name="version_3_2_0"></a>
<h3>2005 March 21 (3.2.0)</h3><p><ul>
<li>Added support for ALTER TABLE ADD COLUMN.</li>
<li>Added support for the "T" separator in ISO-8601 date/time strings.</li>
<li>Improved support for Cygwin.</li>
<li>Numerous bug fixes and documentation updates.</li>
</ul></p><a name="version_3_1_6"></a>
<h3>2005 March 16 (3.1.6)</h3><p><ul>
<li>Fix a bug that could cause database corruption when inserting
    record into tables with around 125 columns.</li>
<li>sqlite3_step() is now much more likely to invoke the busy handler
    and less likely to return SQLITE_BUSY.</li>
<li>Fix memory leaks that used to occur after a malloc() failure.</li>
</ul></p><a name="version_3_1_5"></a>
<h3>2005 March 11 (3.1.5)</h3><p><ul>
<li>The ioctl on Mac OS X to control syncing to disk is F_FULLFSYNC,
    not F_FULLSYNC.  The previous release had it wrong.</li>
</ul></p><a name="version_3_1_4"></a>
<h3>2005 March 10 (3.1.4)</h3><p><ul>
<li>Fix a bug in autovacuum that could cause database corruption if
a CREATE UNIQUE INDEX fails because of a constraint violation.
This problem only occurs if the new autovacuum feature introduced in
version 3.1 is turned on.</li>
<li>The F_FULLSYNC ioctl (currently only supported on Mac OS X) is disabled
if the synchronous pragma is set to something other than "full".</li>
<li>Add additional forward compatibility to the future version 3.2 database 
file format.</li>
<li>Fix a bug in WHERE clauses of the form (rowid<'2')</li>
<li>New <a href="compile.html#omitfeatures">SQLITE_OMIT_...</a> compile-time options added</li>
<li>Updates to the man page</li>
<li>Remove the use of strcasecmp() from the shell</li>
<li>Windows DLL exports symbols Tclsqlite_Init and Sqlite_Init</li>
</ul></p><a name="version_3_1_3"></a>
<h3>2005 February 19 (3.1.3)</h3><p><ul>
<li>Fix a problem with VACUUM on databases from which tables containing
AUTOINCREMENT have been dropped.</li>
<li>Add forward compatibility to the future version 3.2 database file
format.</li>
<li>Documentation updates</li>
</ul></p><a name="version_3_1_2"></a>
<h3>2005 February 15 (3.1.2)</h3><p><ul>
<li>Fix a bug that can lead to database corruption if there are two
open connections to the same database and one connection does a VACUUM
and the second makes some change to the database.</li>
<li>Allow "?" parameters in the LIMIT clause.</li>
<li>Fix VACUUM so that it works with AUTOINCREMENT.</li>
<li>Fix a race condition in AUTOVACUUM that can lead to corrupt databases</li>
<li>Add a numeric version number to the sqlite3.h include file.</li>
<li>Other minor bug fixes and performance enhancements.</li>
</ul></p><a name="version_2_8_16"></a>
<h3>2005 February 15 (2.8.16)</h3><p><ul>
<li>Fix a bug that can lead to database corruption if there are two
open connections to the same database and one connection does a VACUUM
and the second makes some change to the database.</li>
<li>Correctly handle quoted names in CREATE INDEX statements.</li>
<li>Fix a naming conflict between sqlite.h and sqlite3.h.</li>
<li>Avoid excess heap usage when copying expressions.</li>
<li>Other minor bug fixes.</li>
</ul></p><h3>2005 February 1 (3.1.1 BETA)</h3><p><ul>
<li>Automatic caching of prepared statements in the TCL interface</li>
<li>ATTACH and DETACH as well as some other operations cause existing
    prepared statements to expire.</li>
<li>Numerous minor bug fixes</li>
</ul></p><h3>2005 January 21 (3.1.0 ALPHA)</h3><p><ul>
<li>Autovacuum support added</li>
<li>CURRENT_TIME, CURRENT_DATE, and CURRENT_TIMESTAMP added</li>
<li>Support for the EXISTS clause added.</li>
<li>Support for correlated subqueries added.</li>
<li>Added the ESCAPE clause on the LIKE operator.</li>
<li>Support for ALTER TABLE ... RENAME TABLE ... added</li>
<li>AUTOINCREMENT keyword supported on INTEGER PRIMARY KEY</li>
<li>Many SQLITE_OMIT_ macros inserts to omit features at compile-time
    and reduce the library footprint.</li>
<li>The REINDEX command was added.</li>
<li>The engine no longer consults the main table if it can get
    all the information it needs from an index.</li>
<li>Many nuisance bugs fixed.</li>
</ul></p><a name="version_3_0_8"></a>
<h3>2004 October 11 (3.0.8)</h3><p><ul>
<li>Add support for DEFERRED, IMMEDIATE, and EXCLUSIVE transactions.</li>
<li>Allow new user-defined functions to be created when there are
already one or more precompiled SQL statements.<li>
<li>Fix portability problems for MinGW/MSYS.</li>
<li>Fix a byte alignment problem on 64-bit Sparc machines.</li>
<li>Fix the ".import" command of the shell so that it ignores \r
characters at the end of lines.</li>
<li>The "csv" mode option in the shell puts strings inside double-quotes.</li>
<li>Fix typos in documentation.</li>
<li>Convert array constants in the code to have type "const".</li>
<li>Numerous code optimizations, specially optimizations designed to
make the code footprint smaller.</li>
</ul></p><a name="version_3_0_7"></a>
<h3>2004 September 18 (3.0.7)</h3><p><ul>
<li>The BTree module allocates large buffers using malloc() instead of
    off of the stack, in order to play better on machines with limited
    stack space.</li>
<li>Fixed naming conflicts so that versions 2.8 and 3.0 can be
    linked and used together in the same ANSI-C source file.</li>
<li>New interface: sqlite3_bind_parameter_index()</li>
<li>Add support for wildcard parameters of the form: "?nnn"</li>
<li>Fix problems found on 64-bit systems.</li>
<li>Removed encode.c file (containing unused routines) from the 
    version 3.0 source tree.</li>
<li>The sqlite3_trace() callbacks occur before each statement
    is executed, not when the statement is compiled.</li>
<li>Makefile updates and miscellaneous bug fixes.</li>
</ul></p><h3>2004 September 02 (3.0.6 beta)</h3><p><ul>
<li>Better detection and handling of corrupt database files.</li>
<li>The sqlite3_step() interface returns SQLITE_BUSY if it is unable
    to commit a change because of a lock</li>
<li>Combine the implementations of LIKE and GLOB into a single
    pattern-matching subroutine.</li>
<li>Miscellaneous code size optimizations and bug fixes</li>
</ul></p><h3>2004 August 29 (3.0.5 beta)</h3><p><ul>
<li>Support for ":AAA" style bind parameter names.</li>
<li>Added the new sqlite3_bind_parameter_name() interface.</li>
<li>Support for TCL variable names embedded in SQL statements in the
    TCL bindings.</li>
<li>The TCL bindings transfer data without necessarily doing a conversion
    to a string.</li>
<li>The database for TEMP tables is not created until it is needed.</li>
<li>Add the ability to specify an alternative temporary file directory
    using the "sqlite_temp_directory" global variable.</li>
<li>A compile-time option (SQLITE_BUSY_RESERVED_LOCK) causes the busy
    handler to be called when there is contention for a RESERVED lock.</li>
<li>Various bug fixes and optimizations</li>
</ul></p><h3>2004 August 8 (3.0.4 beta)</h3><p><ul>
<li>CREATE TABLE and DROP TABLE now work correctly as prepared statements.</li>
<li>Fix a bug in VACUUM and UNIQUE indices.</li>
<li>Add the ".import" command to the command-line shell.</li>
<li>Fix a bug that could cause index corruption when an attempt to
    delete rows of a table is blocked by a pending query.</li>
<li>Library size optimizations.</li>
<li>Other minor bug fixes.</li>
</ul></p><a name="version_2_8_15"></a>
<h3>2004 July 22 (2.8.15)</h3><p><ul>
<li>This is a maintenance release only.  Various minor bugs have been
fixed and some portability enhancements are added.</li>
</ul></p><h3>2004 July 22 (3.0.3 beta)</h3><p><ul>
<li>The second beta release for SQLite 3.0.</li>
<li>Add support for "PRAGMA page_size" to adjust the page size of
the database.</li>
<li>Various bug fixes and documentation updates.</li>
</ul></p><h3>2004 June 30 (3.0.2 beta)</h3><p><ul>
<li>The first beta release for SQLite 3.0.</li>
</ul></p><h3>2004 June 22 (3.0.1 alpha)</h3><p><ul>
<li><font color="red"><b>
    *** Alpha Release - Research And Testing Use Only ***</b></font>
<li>Lots of bug fixes.</li>
</ul></p><h3>2004 June 18 (3.0.0 alpha)</h3><p><ul>
<li><font color="red"><b>
    *** Alpha Release - Research And Testing Use Only ***</b></font>
<li>Support for internationalization including UTF-8, UTF-16, and
    user defined collating sequences.</li>
<li>New file format that is 25% to 35% smaller for typical use.</li>
<li>Improved concurrency.</li>
<li>Atomic commits for ATTACHed databases.</li>
<li>Remove cruft from the APIs.</li>
<li>BLOB support.</li>
<li>64-bit rowids.</li>
<li><a href="version3.html">More information</a>.
</ul></p><a name="version_2_8_14"></a>
<h3>2004 June 9 (2.8.14)</h3><p><ul>
<li>Fix the min() and max() optimizer so that it works when the FROM
    clause consists of a subquery.</li>
<li>Ignore extra whitespace at the end of of "." commands in the shell.</li>
<li>Bundle sqlite_encode_binary() and sqlite_decode_binary() with the 
    library.</li>
<li>The TEMP_STORE and DEFAULT_TEMP_STORE pragmas now work.</li>
<li>Code changes to compile cleanly using OpenWatcom.</li>
<li>Fix VDBE stack overflow problems with INSTEAD OF triggers and
    NULLs in IN operators.</li>
<li>Add the global variable sqlite_temp_directory which if set defines the
    directory in which temporary files are stored.</li>
<li>sqlite_interrupt() plays well with VACUUM.</li>
<li>Other minor bug fixes.</li>
</ul></p><a name="version_2_8_13"></a>
<h3>2004 March 8 (2.8.13)</h3><p><ul>
<li>Refactor parts of the code in order to make the code footprint
    smaller.  The code is now also a little bit faster.</li>
<li>sqlite_exec() is now implemented as a wrapper around sqlite_compile()
    and sqlite_step().</li>
<li>The built-in min() and max() functions now honor the difference between
    NUMERIC and TEXT datatypes.  Formerly, min() and max() always assumed
    their arguments were of type NUMERIC.</li>
<li>New HH:MM:SS modifier to the built-in date/time functions.</li>
<li>Experimental sqlite_last_statement_changes() API added.  Fixed
    the last_insert_rowid() function so that it works correctly with
    triggers.</li>
<li>Add functions prototypes for the database encryption API.</li>
<li>Fix several nuisance bugs.</li>
</ul></p><a name="version_2_8_12"></a>
<h3>2004 February 8 (2.8.12)</h3><p><ul>
<li>Fix a bug that will might corrupt the rollback journal if a power failure
    or external program halt occurs in the middle of a COMMIT.  The corrupt
    journal can lead to database corruption when it is rolled back.</li>
<li>Reduce the size and increase the speed of various modules, especially
    the virtual machine.</li>
<li>Allow "&lt;expr&gt; IN &lt;table&gt;" as a shorthand for
    "&lt;expr&gt; IN (SELECT * FROM &lt;table&gt;".</li>
<li>Optimizations to the sqlite_mprintf() routine.</li>
<li>Make sure the MIN() and MAX() optimizations work within subqueries.</li>
</ul></p><a name="version_2_8_11"></a>
<h3>2004 January 14 (2.8.11)</h3><p><ul>
<li>Fix a bug in how the IN operator handles NULLs in subqueries.  The bug
    was introduced by the previous release.</li>
</ul></p><a name="version_2_8_10"></a>
<h3>2004 January 13 (2.8.10)</h3><p><ul>
<li>Fix a potential database corruption problem on Unix caused by the fact
    that all POSIX advisory locks are cleared whenever you close() a file.
    The work around it to embargo all close() calls while locks are 
    outstanding.</li>
<li>Performance enhancements on some corner cases of COUNT(*).</li>
<li>Make sure the in-memory backend response sanely if malloc() fails.</li>
<li>Allow sqlite_exec() to be called from within user-defined SQL
    functions.</li>
<li>Improved accuracy of floating-point conversions using "long double".</li>
<li>Bug fixes in the experimental date/time functions.</li>
</ul></p><a name="version_2_8_9"></a>
<h3>2004 January 5 (2.8.9)</h3><p><ul>
<li>Fix a 32-bit integer overflow problem that could result in corrupt
    indices in a database if large negative numbers (less than -2147483648)
    were inserted into an indexed numeric column.</li>
<li>Fix a locking problem on multi-threaded Linux implementations.</li>
<li>Always use "." instead of "," as the decimal point even if the locale
    requests ",".</li>
<li>Added UTC to localtime conversions to the experimental date/time
    functions.</li>
<li>Bug fixes to date/time functions.</li>
</ul></p><a name="version_2_8_8"></a>
<h3>2003 December 17 (2.8.8)</h3><p><ul>
<li>Fix a critical bug introduced into 2.8.0 which could cause
    database corruption.</li>
<li>Fix a problem with 3-way joins that do not use indices</li>
<li>The VACUUM command now works with the non-callback API</li>
<li>Improvements to the "PRAGMA integrity_check" command</li>
</ul></p><a name="version_2_8_7"></a>
<h3>2003 December 4 (2.8.7)</h3><p><ul>
<li>Added experimental sqlite_bind() and sqlite_reset() APIs.</li>
<li>If the name of the database is an empty string, open a new database
    in a temporary file that is automatically deleted when the database
    is closed.</li>
<li>Performance enhancements in the lemon-generated parser</li>
<li>Experimental date/time functions revised.</li>
<li>Disallow temporary indices on permanent tables.</li>
<li>Documentation updates and typo fixes</li>
<li>Added experimental sqlite_progress_handler() callback API</li>
<li>Removed support for the Oracle8 outer join syntax.</li>
<li>Allow GLOB and LIKE operators to work as functions.</li>
<li>Other minor documentation and makefile changes and bug fixes.</li>
</ul></p><a name="version_2_8_6"></a>
<h3>2003 August 21 (2.8.6)</h3><p><ul>
<li>Moved the CVS repository to www.sqlite.org</li>
<li>Update the NULL-handling documentation.</li>
<li>Experimental date/time functions added.</li>
<li>Bug fix: correctly evaluate a view of a view without segfaulting.</li>
<li>Bug fix: prevent database corruption if you dropped a
    trigger that had the same name as a table.</li>
<li>Bug fix: allow a VACUUM (without segfaulting) on an empty
    database after setting the EMPTY_RESULT_CALLBACKS pragma.</li>
<li>Bug fix: if an integer value will not fit in a 32-bit int, store it in
    a double instead.</li>
<li>Bug fix: Make sure the journal file directory entry is committed to disk
    before writing the database file.</li>
</ul></p><a name="version_2_8_5"></a>
<h3>2003 July 22 (2.8.5)</h3><p><ul>
<li>Make LIMIT work on a compound SELECT statement.</li>
<li>LIMIT 0 now shows no rows.  Use LIMIT -1 to see all rows.</li>
<li>Correctly handle comparisons between an INTEGER PRIMARY KEY and
    a floating point number.</li>
<li>Fix several important bugs in the new ATTACH and DETACH commands.</li>
<li>Updated the <a href="nulls.html">NULL-handling document</a>.</li> 
<li>Allow NULL arguments in sqlite_compile() and sqlite_step().</li>
<li>Many minor bug fixes</li>
</ul></p><a name="version_2_8_4"></a>
<h3>2003 June 29 (2.8.4)</h3><p><ul>
<li>Enhanced the "PRAGMA integrity_check" command to verify indices.</li>
<li>Added authorization hooks for the new ATTACH and DETACH commands.</li>
<li>Many documentation updates</li>
<li>Many minor bug fixes</li>
</ul></p><a name="version_2_8_3"></a>
<h3>2003 June 4 (2.8.3)</h3><p><ul>
<li>Fix a problem that will corrupt the indices on a table if you
    do an INSERT OR REPLACE or an UPDATE OR REPLACE on a table that
    contains an INTEGER PRIMARY KEY plus one or more indices.</li>
<li>Fix a bug in Windows locking code so that locks work correctly
    when simultaneously accessed by Win95 and WinNT systems.</li>
<li>Add the ability for INSERT and UPDATE statements to refer to the
    "rowid" (or "_rowid_" or "oid") columns.</li>
<li>Other important bug fixes</li>
</ul></p><a name="version_2_8_2"></a>
<h3>2003 May 17 (2.8.2)</h3><p><ul>
<li>Fix a problem that will corrupt the database file if you drop a
    table from the main database that has a TEMP index.</li>
</ul></p><a name="version_2_8_1"></a>
<h3>2003 May 16 (2.8.1)</h3><p><ul>
<li>Reactivated the VACUUM command that reclaims unused disk space in 
    a database file.</li>
<li>Added the ATTACH and DETACH commands to allow interacting with multiple
    database files at the same time.</li>
<li>Added support for TEMP triggers and indices.</li>
<li>Added support for in-memory databases.</li>
<li>Removed the experimental sqlite_open_aux_file().  Its function is
    subsumed in the new ATTACH command.</li>
<li>The precedence order for ON CONFLICT clauses was changed so that
    ON CONFLICT clauses on BEGIN statements have a higher precedence than
    ON CONFLICT clauses on constraints.
<li>Many, many bug fixes and compatibility enhancements.</li>
</ul></p><a name="version_2_8_0"></a>
<h3>2003 Feb 16 (2.8.0)</h3><p><ul>
<li>Modified the journal file format to make it more resistant to corruption
    that can occur after an OS crash or power failure.</li>
<li>Added a new C/C++ API that does not use callback for returning data.</li>
</ul></p><a name="version_2_7_6"></a>
<h3>2003 Jan 25 (2.7.6)</h3><p><ul>
<li>Performance improvements.  The library is now much faster.</li>
<li>Added the <b>sqlite_set_authorizer()</b> API.  Formal documentation has
    not been written - see the source code comments for instructions on
    how to use this function.</li>
<li>Fix a bug in the GLOB operator that was preventing it from working
    with upper-case letters.</li>
<li>Various minor bug fixes.</li>
</ul></p><a name="version_2_7_5"></a>
<h3>2002 Dec 27 (2.7.5)</h3><p><ul>
<li>Fix an uninitialized variable in pager.c which could (with a probability
    of about 1 in 4 billion) result in a corrupted database.</li>
</ul></p><a name="version_2_7_4"></a>
<h3>2002 Dec 17 (2.7.4)</h3><p><ul>
<li>Database files can now grow to be up to 2&#94;41 bytes.  The old limit
    was 2&#94;31 bytes.</li>
<li>The optimizer will now scan tables in the reverse if doing so will
    satisfy an ORDER BY ... DESC clause.</li>
<li>The full pathname of the database file is now remembered even if
    a relative path is passed into sqlite_open().  This allows 
    the library to continue operating correctly after a chdir().</li>
<li>Speed improvements in the VDBE.</li>
<li>Lots of little bug fixes.</li>
</ul></p><a name="version_2_7_3"></a>
<h3>2002 Oct 30 (2.7.3)</h3><p><ul>
<li>Various compiler compatibility fixes.</li>
<li>Fix a bug in the "expr IN ()" operator.</li>
<li>Accept column names in parentheses.</li>
<li>Fix a problem with string memory management in the VDBE</li>
<li>Fix a bug in the "table_info" pragma"</li>
<li>Export the sqlite_function_type() API function in the Windows DLL</li>
<li>Fix locking behavior under Windows</li>
<li>Fix a bug in LEFT OUTER JOIN</li>
</ul></p><a name="version_2_7_2"></a>
<h3>2002 Sep 25 (2.7.2)</h3><p><ul>
<li>Prevent journal file overflows on huge transactions.</li>
<li>Fix a memory leak that occurred when sqlite_open() failed.</li>
<li>Honor the ORDER BY and LIMIT clause of a SELECT even if the
    result set is used for an INSERT.</li>
<li>Do not put write locks on the file used to hold TEMP tables.</li>
<li>Added documentation on SELECT DISTINCT and on how SQLite handles NULLs.</li>
<li>Fix a problem that was causing poor performance when many thousands
    of SQL statements were executed by a single sqlite_exec() call.</li>
</ul></p><a name="version_2_7_1"></a>
<h3>2002 Aug 31 (2.7.1)</h3><p><ul>
<li>Fix a bug in the ORDER BY logic that was introduced in version 2.7.0</li>
<li>C-style comments are now accepted by the tokenizer.</li>
<li>INSERT runs a little faster when the source is a SELECT statement.</li>
</ul></p><a name="version_2_7_0"></a>
<h3>2002 Aug 25 (2.7.0)</h3><p><ul>
<li>Make a distinction between numeric and text values when sorting.
    Text values sort according to memcmp().  Numeric values sort in
    numeric order.</li>
<li>Allow multiple simultaneous readers under Windows by simulating
    the reader/writers locks that are missing from Win95/98/ME.</li>
<li>An error is now returned when trying to start a transaction if
    another transaction is already active.</li>
</ul></p><a name="version_2_6_3"></a>
<h3>2002 Aug 12 (2.6.3)</h3><p><ul>
<li>Add the ability to read both little-endian and big-endian databases.
    So a database created under SunOS or Mac OS X can be read and written
    under Linux or Windows and vice versa.</li>
<li>Convert to the new website: http://www.sqlite.org/</li>
<li>Allow transactions to span Linux Threads</li>
<li>Bug fix in the processing of the ORDER BY clause for GROUP BY queries</li>
</ul></p><a name="version_2_6_2"></a>
<h3>2002 Jly 30 (2.6.2)</h3><p><ul>
<li>Text files read by the COPY command can now have line terminators
    of LF,  CRLF, or CR.</li>
<li>SQLITE_BUSY is handled correctly if encountered during database
    initialization.</li>
<li>Fix to UPDATE triggers on TEMP tables.</li>
<li>Documentation updates.</li>
</ul></p><a name="version_2_6_1"></a>
<h3>2002 Jly 19 (2.6.1)</h3><p><ul>
<li>Include a static string in the library that responds to the RCS
    "ident" command and which contains the library version number.</li>
<li>Fix an assertion failure that occurred when deleting all rows of
    a table with the "count_changes" pragma turned on.</li>
<li>Better error reporting when problems occur during the automatic
    2.5.6 to 2.6.0 database format upgrade.</li>
</ul></p><a name="version_2_6_0"></a>
<h3>2002 Jly 17 (2.6.0)</h3><p><ul>
<li>Change the format of indices to correct a design flaw the originated
    with version 2.1.0.  <font color="red">*** This is an incompatible
    file format change ***</font>  When version 2.6.0 or later of the
    library attempts to open a database file created by version 2.5.6 or
    earlier, it will automatically and irreversibly convert the file format.
    <b>Make backup copies of older database files before opening them with
    version 2.6.0 of the library.</b>
    </li>
</ul></p><a name="version_2_5_6"></a>
<h3>2002 Jly 7 (2.5.6)</h3><p><ul>
<li>Fix more problems with rollback.  Enhance the test suite to exercise
    the rollback logic extensively in order to prevent any future problems.
    </li>
</ul></p><a name="version_2_5_5"></a>
<h3>2002 Jly 6 (2.5.5)</h3><p><ul>
<li>Fix a bug which could cause database corruption during a rollback.
    This bugs was introduced in version 2.4.0 by the freelist
    optimization of checkin &#91;410&#93;.</li>
<li>Fix a bug in aggregate functions for VIEWs.</li>
<li>Other minor changes and enhancements.</li>
</ul></p><a name="version_2_5_4"></a>
<h3>2002 Jly 1 (2.5.4)</h3><p><ul>
<li>Make the "AS" keyword optional again.</li>
<li>The datatype of columns now appear in the 4th argument to the
    callback.</li>
<li>Added the <b>sqlite_open_aux_file()</b> API, though it is still
    mostly undocumented and untested.</li>
<li>Added additional test cases and fixed a few bugs that those
    test cases found.</li>
</ul></p><a name="version_2_5_3"></a>
<h3>2002 Jun 24 (2.5.3)</h3><p><ul>
<li>Bug fix:  Database corruption can occur due to the optimization
    that was introduced in version 2.4.0 (check-in &#91;410&#93;).  The problem
    should now be fixed.  The use of versions 2.4.0 through 2.5.2 is
    not recommended.</li>
</ul></p><a name="version_2_5_2"></a>
<h3>2002 Jun 24 (2.5.2)</h3><p><ul>
<li>Added the new <b>SQLITE_TEMP_MASTER</b> table which records the schema
    for temporary tables in the same way that <b>SQLITE_MASTER</b> does for
    persistent tables.</li>
<li>Added an optimization to UNION ALL</li>
<li>Fixed a bug in the processing of LEFT OUTER JOIN</li>
<li>The LIMIT clause now works on subselects</li>
<li>ORDER BY works on subselects</li>
<li>There is a new TypeOf() function used to determine if an expression
    is numeric or text.</li>
<li>Autoincrement now works for INSERT from a SELECT.</li>
</ul></p><a name="version_2_5_1"></a>
<h3>2002 Jun 19 (2.5.1)</h3><p><ul>
<li>The query optimizer now attempts to implement the ORDER BY clause
    using an index.  Sorting is still used if not suitable index is
    available.</li>
</ul></p><a name="version_2_5_0"></a>
<h3>2002 Jun 17 (2.5.0)</h3><p><ul>
<li>Added support for row triggers.</li>
<li>Added SQL-92 compliant handling of NULLs.</li>
<li>Add support for the full SQL-92 join syntax and LEFT OUTER JOINs.</li>
<li>Double-quoted strings interpreted as column names not text literals.</li>
<li>Parse (but do not implement) foreign keys.</li>
<li>Performance improvements in the parser, pager, and WHERE clause code
    generator.</li>
<li>Make the LIMIT clause work on subqueries.  (ORDER BY still does not
    work, though.)</li>
<li>Added the "%Q" expansion to sqlite_*_printf().</li>
<li>Bug fixes too numerous to mention (see the change log).</li>
</ul></p><a name="version_2_4_12"></a>
<h3>2002 May 09 (2.4.12)</h3><p><ul>
<li>Added logic to detect when the library API routines are called out
    of sequence.</li>
</ul></p><a name="version_2_4_11"></a>
<h3>2002 May 08 (2.4.11)</h3><p><ul>
<li>Bug fix: Column names in the result set were not being generated
    correctly for some (rather complex) VIEWs.  This could cause a
    segfault under certain circumstances.</li>
</ul></p><a name="version_2_4_10"></a>
<h3>2002 May 02 (2.4.10)</h3><p><ul>
<li>Bug fix: Generate correct column headers when a compound SELECT is used
    as a subquery.</li>
<li>Added the sqlite_encode_binary() and sqlite_decode_binary() functions to
    the source tree.  But they are not yet linked into the library.</li>
<li>Documentation updates.</li>
<li>Export the sqlite_changes() function from Windows DLLs.</li>
<li>Bug fix: Do not attempt the subquery flattening optimization on queries
    that lack a FROM clause.  To do so causes a segfault.</li>
</ul></p><a name="version_2_4_9"></a>
<h3>2002 Apr 21 (2.4.9)</h3><p><ul>
<li>Fix a bug that was causing the precompiled binary of SQLITE.EXE to
    report "out of memory" under Windows 98.</li>
</ul></p><a name="version_2_4_8"></a>
<h3>2002 Apr 20 (2.4.8)</h3><p><ul>
<li>Make sure VIEWs are created after their corresponding TABLEs in the
    output of the <b>.dump</b> command in the shell.</li>
<li>Speed improvements: Do not do synchronous updates on TEMP tables.</li>
<li>Many improvements and enhancements to the shell.</li>
<li>Make the GLOB and LIKE operators functions that can be overridden
    by a programmer.  This allows, for example, the LIKE operator to
    be changed to be case sensitive.</li>
</ul></p><a name="version_2_4_7"></a>
<h3>2002 Apr 06 (2.4.7)</h3><p><ul>
<li>Add the ability to put TABLE.* in the column list of a
    SELECT statement.</li>
<li>Permit SELECT statements without a FROM clause.</li>
<li>Added the <b>last_insert_rowid()</b> SQL function.</li>
<li>Do not count rows where the IGNORE conflict resolution occurs in
    the row count.</li>
<li>Make sure functions expressions in the VALUES clause of an INSERT
    are correct.</li>
<li>Added the <b>sqlite_changes()</b> API function to return the number
    of row that changed in the most recent operation.</li>
</ul></p><a name="version_2_4_6"></a>
<h3>2002 Apr 02 (2.4.6)</h3><p><ul>
<li>Bug fix: Correctly handle terms in the WHERE clause of a join that
    do not contain a comparison operator.</li>
</ul></p><a name="version_2_4_5"></a>
<h3>2002 Apr 01 (2.4.5)</h3><p><ul>
<li>Bug fix: Correctly handle functions that appear in the WHERE clause
    of a join.</li>
<li>When the PRAGMA vdbe_trace=ON is set, correctly print the P3 operand
    value when it is a pointer to a structure rather than a pointer to
    a string.</li>
<li>When inserting an explicit NULL into an INTEGER PRIMARY KEY, convert
    the NULL value into a unique key automatically.</li>
</ul></p><a name="version_2_4_4"></a>
<h3>2002 Mar 24 (2.4.4)</h3><p><ul>
<li>Allow "VIEW" to be a column name</li>
<li>Added support for CASE expressions (patch from Dan Kennedy)</li>
<li>Added RPMS to the delivery (patches from Doug Henry)</li>
<li>Fix typos in the documentation</li>
<li>Cut over configuration management to a new CVS repository with
    its own CVSTrac bug tracking system.</li>
</ul></p><a name="version_2_4_3"></a>
<h3>2002 Mar 22 (2.4.3)</h3><p><ul>
<li>Fix a bug in SELECT that occurs when a compound SELECT is used as a
    subquery in the FROM of a SELECT.</li>
<li>The <b>sqlite_get_table()</b> function now returns an error if you
    give it two or more SELECTs that return different numbers of columns.</li>
</ul></p><a name="version_2_4_2"></a>
<h3>2002 Mar 14 (2.4.2)</h3><p><ul>
<li>Bug fix: Fix an assertion failure that occurred when ROWID was a column
    in a SELECT statement on a view.</li>
<li>Bug fix: Fix an uninitialized variable in the VDBE that would could an
    assert failure.</li>
<li>Make the os.h header file more robust in detecting when the compile is
    for Windows and when it is for Unix.</li>
</ul></p><a name="version_2_4_1"></a>
<h3>2002 Mar 13 (2.4.1)</h3><p><ul>
<li>Using an unnamed subquery in a FROM clause would cause a segfault.</li>
<li>The parser now insists on seeing a semicolon or the end of input before
    executing a statement.  This avoids an accidental disaster if the
    WHERE keyword is misspelled in an UPDATE or DELETE statement.</li>
</ul></p><a name="version_2_4_0"></a>
<h3>2002 Mar 10 (2.4.0)</h3><p><ul>
<li>Change the name of the sanity_check PRAGMA to <b>integrity_check</b>
    and make it available in all compiles.</li>
<li>SELECT min() or max() of an indexed column with no WHERE or GROUP BY
    clause is handled as a special case which avoids a complete table scan.</li>
<li>Automatically generated ROWIDs are now sequential.</li>
<li>Do not allow dot-commands of the command-line shell to occur in the
    middle of a real SQL command.</li>
<li>Modifications to the "lemon" parser generator so that the parser tables
    are 4 times smaller.</li>
<li>Added support for user-defined functions implemented in C.</li>
<li>Added support for new functions: <b>coalesce()</b>, <b>lower()</b>,
    <b>upper()</b>, and <b>random()</b>
<li>Added support for VIEWs.</li>
<li>Added the subquery flattening optimizer.</li>
<li>Modified the B-Tree and Pager modules so that disk pages that do not
    contain real data (free pages) are not journaled and are not
    written from memory back to the disk when they change.  This does not 
    impact database integrity, since the
    pages contain no real data, but it does make large INSERT operations
    about 2.5 times faster and large DELETEs about 5 times faster.</li>
<li>Made the CACHE_SIZE pragma persistent</li>
<li>Added the SYNCHRONOUS pragma</li>
<li>Fixed a bug that was causing updates to fail inside of transactions when
    the database contained a temporary table.</li>
</ul></p><a name="version_2_3_3"></a>
<h3>2002 Feb 18 (2.3.3)</h3><p><ul>
<li>Allow identifiers to be quoted in square brackets, for compatibility
    with MS-Access.</li>
<li>Added support for sub-queries in the FROM clause of a SELECT.</li>
<li>More efficient implementation of sqliteFileExists() under Windows.
    (by Joel Luscy)</li>
<li>The VALUES clause of an INSERT can now contain expressions, including
    scalar SELECT clauses.</li>
<li>Added support for CREATE TABLE AS SELECT</li>
<li>Bug fix: Creating and dropping a table all within a single
    transaction was not working.</li>
</ul></p><a name="version_2_3_2"></a>
<h3>2002 Feb 14 (2.3.2)</h3><p><ul>
<li>Bug fix: There was an incorrect assert() in pager.c.  The real code was
    all correct (as far as is known) so everything should work OK if you
    compile with -DNDEBUG=1.  When asserts are not disabled, there
    could be a fault.</li>
</ul></p><a name="version_2_3_1"></a>
<h3>2002 Feb 13 (2.3.1)</h3><p><ul>
<li>Bug fix: An assertion was failing if "PRAGMA full_column_names=ON;" was
    set and you did a query that used a rowid, like this:  
    "SELECT rowid, * FROM ...".</li>
</ul></p><a name="version_2_3_0"></a>
<h3>2002 Jan 30 (2.3.0)</h3><p><ul>
<li>Fix a serious bug in the INSERT command which was causing data to go
    into the wrong columns if the data source was a SELECT and the INSERT
    clauses specified its columns in some order other than the default.</li>
<li>Added the ability to resolve constraint conflicts is ways other than
    an abort and rollback.  See the documentation on the "ON CONFLICT"
    clause for details.</li>
<li>Temporary files are now automatically deleted by the operating system
    when closed.  There are no more dangling temporary files on a program
    crash.  (If the OS crashes, fsck will delete the file after reboot 
    under Unix.  I do not know what happens under Windows.)</li>
<li>NOT NULL constraints are honored.</li>
<li>The COPY command puts NULLs in columns whose data is '\N'.</li>
<li>In the COPY command, backslash can now be used to escape a newline.</li>
<li>Added the SANITY_CHECK pragma.</li>
</ul></p><a name="version_2_2_5"></a>
<h3>2002 Jan 28 (2.2.5)</h3><p><ul>
<li>Important bug fix: the IN operator was not working if either the
    left-hand or right-hand side was derived from an INTEGER PRIMARY KEY.</li>
<li>Do not escape the backslash '\' character in the output of the
    <b>sqlite</b> command-line access program.</li>
</ul></p><a name="version_2_2_4"></a>
<h3>2002 Jan 22 (2.2.4)</h3><p><ul>
<li>The label to the right of an AS in the column list of a SELECT can now
    be used as part of an expression in the WHERE, ORDER BY, GROUP BY, and/or
    HAVING clauses.</li>
<li>Fix a bug in the <b>-separator</b> command-line option to the <b>sqlite</b>
    command.</li>
<li>Fix a problem with the sort order when comparing upper-case strings against
    characters greater than 'Z' but less than 'a'.</li>
<li>Report an error if an ORDER BY or GROUP BY expression is constant.</li>
</ul></p><a name="version_2_2_3"></a>
<h3>2002 Jan 16 (2.2.3)</h3><p><ul>
<li>Fix warning messages in VC++ 7.0.  (Patches from nicolas352001)</li>
<li>Make the library thread-safe.  (The code is there and appears to work
    but has not been stressed.)</li>
<li>Added the new <b>sqlite_last_insert_rowid()</b> API function.</li>
</ul></p><a name="version_2_2_2"></a>
<h3>2002 Jan 13 (2.2.2)</h3><p><ul>
<li>Bug fix: An assertion was failing when a temporary table with an index
    had the same name as a permanent table created by a separate process.</li>
<li>Bug fix: Updates to tables containing an INTEGER PRIMARY KEY and an
    index could fail.</li>
</ul></p><a name="version_2_2_1"></a>
<h3>2002 Jan 9 (2.2.1)</h3><p><ul>
<li>Bug fix: An attempt to delete a single row of a table with a WHERE
    clause of "ROWID=x" when no such rowid exists was causing an error.</li>
<li>Bug fix: Passing in a NULL as the 3rd parameter to <b>sqlite_open()</b>
    would sometimes cause a coredump.</li>
<li>Bug fix: DROP TABLE followed by a CREATE TABLE with the same name all
    within a single transaction was causing a coredump.</li>
<li>Makefile updates from A. Rottmann</li>
</ul></p><a name="version_2_2_0"></a>
<h3>2001 Dec 22 (2.2.0)</h3><p><ul>
<li>Columns of type INTEGER PRIMARY KEY are actually used as the primary
    key in underlying B-Tree representation of the table.</li>
<li>Several obscure, unrelated bugs were found and fixed while 
    implemented the integer primary key change of the previous bullet.</li>
<li>Added the ability to specify "*" as part of a larger column list in
    the result section of a SELECT statement.  For example:
    <nobr>"<b>SELECT rowid, * FROM table1;</b>"</nobr>.</li>
<li>Updates to comments and documentation.</li>
</ul></p><a name="version_2_1_7"></a>
<h3>2001 Dec 14 (2.1.7)</h3><p><ul>
<li>Fix a bug in <b>CREATE TEMPORARY TABLE</b> which was causing the
    table to be initially allocated in the main database file instead
    of in the separate temporary file.  This bug could cause the library
    to suffer an assertion failure and it could cause "page leaks" in the
    main database file.
<li>Fix a bug in the b-tree subsystem that could sometimes cause the first
    row of a table to be repeated during a database scan.</li>
</ul></p><a name="version_2_1_6"></a>
<h3>2001 Dec 14 (2.1.6)</h3><p><ul>
<li>Fix the locking mechanism yet again to prevent
    <b>sqlite_exec()</b> from returning SQLITE_PROTOCOL
    unnecessarily.  This time the bug was a race condition in
    the locking code.  This change affects both POSIX and Windows users.</li>
</ul></p><a name="version_2_1_5"></a>
<h3>2001 Dec 6 (2.1.5)</h3><p><ul>
<li>Fix for another problem (unrelated to the one fixed in 2.1.4) 
    that sometimes causes <b>sqlite_exec()</b> to return SQLITE_PROTOCOL
    unnecessarily.  This time the bug was
    in the POSIX locking code and should not effect Windows users.</li>
</ul></p><a name="version_2_1_4"></a>
<h3>2001 Dec 4 (2.1.4)</h3><p><ul>
<li>Sometimes <b>sqlite_exec()</b> would return SQLITE_PROTOCOL when it
    should have returned SQLITE_BUSY.</li>
<li>The fix to the previous bug uncovered a deadlock which was also
    fixed.</li>
<li>Add the ability to put a single .command in the second argument
    of the sqlite shell</li>
<li>Updates to the FAQ</li>
</ul></p><a name="version_2_1_3"></a>
<h3>2001 Nov 23 (2.1.3)</h3><p><ul>
<li>Fix the behavior of comparison operators 
    (ex: "<b>&lt</b>", "<b>==</b>", etc.)
    so that they are consistent with the order of entries in an index.</li>
<li>Correct handling of integers in SQL expressions that are larger than
    what can be represented by the machine integer.</li>
</ul></p><a name="version_2_1_2"></a>
<h3>2001 Nov 22 (2.1.2)</h3><p><ul>
<li>Changes to support 64-bit architectures.</li>
<li>Fix a bug in the locking protocol.</li>
<li>Fix a bug that could (rarely) cause the database to become 
    unreadable after a DROP TABLE due to corruption to the SQLITE_MASTER
    table.</li>
<li>Change the code so that version 2.1.1 databases that were rendered 
    unreadable by the above bug can be read by this version of
    the library even though the SQLITE_MASTER table is (slightly)
    corrupted.</li>
</ul></p><a name="version_2_1_1"></a>
<h3>2001 Nov 13 (2.1.1)</h3><p><ul>
<li>Bug fix: Sometimes arbitrary strings were passed to the callback
    function when the actual value of a column was NULL.</li>
</ul></p><a name="version_2_1_0"></a>
<h3>2001 Nov 12 (2.1.0)</h3><p><ul>
<li>Change the format of data records so that records up to 16MB in size
    can be stored.</li>
<li>Change the format of indices to allow for better query optimization.</li>
<li>Implement the "LIMIT ... OFFSET ..." clause on SELECT statements.</li>
</ul></p><a name="version_2_0_8"></a>
<h3>2001 Nov 3 (2.0.8)</h3><p><ul>
<li>Made selected parameters in API functions <b>const</b>. This should
    be fully backwards compatible.</li>
<li>Documentation updates</li>
<li>Simplify the design of the VDBE by restricting the number of sorters
    and lists to 1.
    In practice, no more than one sorter and one list was ever used anyhow.
    </li>
</ul></p><a name="version_2_0_7"></a>
<h3>2001 Oct 21 (2.0.7)</h3><p><ul>
<li>Any UTF-8 character or ISO8859 character can be used as part of
    an identifier.</li>
<li>Patches from Christian Werner to improve ODBC compatibility and to
    fix a bug in the round() function.</li>
<li>Plug some memory leaks that use to occur if malloc() failed.
    We have been and continue to be memory leak free as long as
    malloc() works.</li>
<li>Changes to some test scripts so that they work on Windows in
    addition to Unix.</li>
</ul></p><a name="version_2_0_6"></a>
<h3>2001 Oct 19 (2.0.6)</h3><p><ul>
<li>Added the EMPTY_RESULT_CALLBACKS pragma</li>
<li>Support for UTF-8 and ISO8859 characters in column and table names.</li>
<li>Bug fix: Compute correct table names with the FULL_COLUMN_NAMES pragma
    is turned on.</li>
</ul></p><a name="version_2_0_5"></a>
<h3>2001 Oct 14 (2.0.5)</h3><p><ul>
<li>Added the COUNT_CHANGES pragma.</li>
<li>Changes to the FULL_COLUMN_NAMES pragma to help out the ODBC driver.</li>
<li>Bug fix: "SELECT count(*)" was returning NULL for empty tables.
    Now it returns 0.</li>
</ul></p><a name="version_2_0_4"></a>
<h3>2001 Oct 13 (2.0.4)</h3><p><ul>
<li>Bug fix: an obscure and relatively harmless bug was causing one of
    the tests to fail when gcc optimizations are turned on.  This release
    fixes the problem.</li>
</ul></p><a name="version_2_0_3"></a>
<h3>2001 Oct 13 (2.0.3)</h3><p><ul>
<li>Bug fix: the <b>sqlite_busy_timeout()</b> function was delaying 1000
    times too long before failing.</li>
<li>Bug fix: an assertion was failing if the disk holding the database
    file became full or stopped accepting writes for some other reason.
    New tests were added to detect similar problems in the future.</li>
<li>Added new operators: <b>&amp;</b> (bitwise-and)
    <b>|</b> (bitwise-or), <b>~</b> (ones-complement),
    <b>&lt;&lt;</b> (shift left), <b>&gt;&gt;</b> (shift right).</li>
<li>Added new functions: <b>round()</b> and <b>abs()</b>.</li>
</ul></p><a name="version_2_0_2"></a>
<h3>2001 Oct 9 (2.0.2)</h3><p><ul>
<li>Fix two bugs in the locking protocol.  (One was masking the other.)</li>
<li>Removed some unused "#include <unistd.h>" that were causing problems
    for VC++.</li>
<li>Fixed <b>sqlite.h</b> so that it is usable from C++</li>
<li>Added the FULL_COLUMN_NAMES pragma.  When set to "ON", the names of
    columns are reported back as TABLE.COLUMN instead of just COLUMN.</li>
<li>Added the TABLE_INFO() and INDEX_INFO() pragmas to help support the
    ODBC interface.</li>
<li>Added support for TEMPORARY tables and indices.</li>
</ul></p><a name="version_2_0_1"></a>
<h3>2001 Oct 2 (2.0.1)</h3><p><ul>
<li>Remove some C++ style comments from btree.c so that it will compile
    using compilers other than gcc.</li>
<li>The ".dump" output from the shell does not work if there are embedded
    newlines anywhere in the data.  This is an old bug that was carried
    forward from version 1.0.  To fix it, the ".dump" output no longer
    uses the COPY command.  It instead generates INSERT statements.</li>
<li>Extend the expression syntax to support "expr NOT NULL" (with a
    space between the "NOT" and the "NULL") in addition to "expr NOTNULL"
    (with no space).</li>
</ul></p><a name="version_2_0_0"></a>
<h3>2001 Sep 28 (2.0.0)</h3><p><ul>
<li>Automatically build binaries for Linux and Windows and put them on
    the website.</li>
</ul></p><h3>2001 Sep 28 (2.0-alpha-4)</h3><p><ul>
<li>Incorporate makefile patches form A. Rottmann to use LIBTOOL</li>
</ul></p><h3>2001 Sep 27 (2.0-alpha-3)</h3><p><ul>
<li>SQLite now honors the UNIQUE keyword in CREATE UNIQUE INDEX.  Primary
    keys are required to be unique.</li>
<li>File format changed back to what it was for alpha-1</li>
<li>Fixes to the rollback and locking behavior</li>
</ul></p><h3>2001 Sep 20 (2.0-alpha-2)</h3><p><ul>
<li>Initial release of version 2.0.  The idea of renaming the library
    to "SQLus" was abandoned in favor of keeping the "SQLite" name and
    bumping the major version number.</li>
<li>The pager and btree subsystems added back. They are now the only
    available backend.</li>
<li>The Dbbe abstraction and the GDBM and memory drivers were removed.</li>
<li>Copyright on all code was disclaimed.  The library is now in the
    public domain.</li>
</ul></p><a name="version_1_0_32"></a>
<h3>2001 Jul 23 (1.0.32)</h3><p><ul>
<li>Pager and btree subsystems removed.  These will be used in a follow-on
    SQL server library named "SQLus".</li>
<li>Add the ability to use quoted strings as table and column names in
    expressions.</li>
</ul></p><a name="version_1_0_31"></a>
<h3>2001 Apr 14 (1.0.31)</h3><p><ul>
<li>Pager subsystem added but not yet used.</li>
<li>More robust handling of out-of-memory errors.</li>
<li>New tests added to the test suite.</li>
</ul></p><a name="version_1_0_30"></a>
<h3>2001 Apr 6 (1.0.30)</h3><p><ul>
<li>Remove the <b>sqlite_encoding</b> TCL variable that was introduced
    in the previous version.</li>
<li>Add options <b>-encoding</b> and <b>-tcl-uses-utf</b> to the
    <b>sqlite</b> TCL command.</li>
<li>Add tests to make sure that tclsqlite was compiled using Tcl header
    files and libraries that match.</li>
</ul></p><a name="version_1_0_29"></a>
<h3>2001 Apr 5 (1.0.29)</h3><p><ul>
<li>The library now assumes data is stored as UTF-8 if the --enable-utf8
    option is given to configure.  The default behavior is to assume
    iso8859-x, as it has always done.  This only makes a difference for
    LIKE and GLOB operators and the LENGTH and SUBSTR functions.</li>
<li>If the library is not configured for UTF-8 and the Tcl library
    is one of the newer ones that uses UTF-8 internally,
    then a conversion from UTF-8 to iso8859 and
    back again is done inside the TCL interface.</li>
</ul></p><a name="version_1_0_28"></a>
<h3>2001 Apr 4 (1.0.28)</h3><p><ul>
<li>Added limited support for transactions.  At this point, transactions
    will do table locking on the GDBM backend.  There is no support (yet)
    for rollback or atomic commit.</li>
<li>Added special column names ROWID, OID, and _ROWID_ that refer to the
    unique random integer key associated with every row of every table.</li>
<li>Additional tests added to the regression suite to cover the new ROWID
    feature and the TCL interface bugs mentioned below.</li>
<li>Changes to the "lemon" parser generator to help it work better when
    compiled using MSVC.</li>
<li>Bug fixes in the TCL interface identified by Oleg Oleinick.</li>
</ul></p><a name="version_1_0_27"></a>
<h3>2001 Mar 20 (1.0.27)</h3><p><ul>
<li>When doing DELETE and UPDATE, the library used to write the record
    numbers of records to be deleted or updated into a temporary file.
    This is changed so that the record numbers are held in memory.</li>
<li>The DELETE command without a WHILE clause just removes the database
    files from the disk, rather than going through and deleting record
    by record.</li>
</ul></p><a name="version_1_0_26"></a>
<h3>2001 Mar 20 (1.0.26)</h3><p><ul>
<li>A serious bug fixed on Windows.  Windows users should upgrade.
    No impact to Unix.</li>
</ul></p><a name="version_1_0_25"></a>
<h3>2001 Mar 15 (1.0.25)</h3><p><ul>
<li>Modify the test scripts to identify tests that depend on system
    load and processor speed and
    to warn the user that a failure of one of those (rare) tests does
    not necessarily mean the library is malfunctioning.  No changes to
    code.
    </li>
</ul></p><a name="version_1_0_24"></a>
<h3>2001 Mar 14 (1.0.24)</h3><p><ul>
<li>Fix a bug which was causing
    the UPDATE command to fail on systems where "malloc(0)" returns
    NULL.  The problem does not appear on Windows, Linux, or HPUX but does 
    cause the library to fail on QNX.
    </li>
</ul></p><a name="version_1_0_23"></a>
<h3>2001 Feb 19 (1.0.23)</h3><p><ul>
<li>An unrelated (and minor) bug from Mark Muranwski fixed.  The algorithm
    for figuring out where to put temporary files for a "memory:" database
    was not working quite right.
    </li>
</ul></p><a name="version_1_0_22"></a>
<h3>2001 Feb 19 (1.0.22)</h3><p><ul>
<li>The previous fix was not quite right.  This one seems to work better.
    </li>
</ul></p><a name="version_1_0_21"></a>
<h3>2001 Feb 19 (1.0.21)</h3><p><ul>
<li>The UPDATE statement was not working when the WHERE clause contained
    some terms that could be satisfied using indices and other terms that
    could not.  Fixed.</li>
</ul></p><a name="version_1_0_20"></a>
<h3>2001 Feb 11 (1.0.20)</h3><p><ul>
<li>Merge development changes into the main trunk.  Future work toward
    using a BTree file structure will use a separate CVS source tree.  This
    CVS tree will continue to support the GDBM version of SQLite only.</li>
</ul></p><a name="version_1_0_19"></a>
<h3>2001 Feb 6 (1.0.19)</h3><p><ul>
<li>Fix a strange (but valid) C declaration that was causing problems
    for QNX.  No logical changes.</li>
</ul></p><a name="version_1_0_18"></a>
<h3>2001 Jan 4 (1.0.18)</h3><p><ul>
<li>Print the offending SQL statement when an error occurs.</li>
<li>Do not require commas between constraints in CREATE TABLE statements.</li>
<li>Added the "-echo" option to the shell.</li>
<li>Changes to comments.</li>
</ul></p><a name="version_1_0_17"></a>
<h3>2000 Dec 10 (1.0.17)</h3><p><ul>
<li>Rewrote <b>sqlite_complete()</b> to make it faster.</li>
<li>Minor tweaks to other code to make it run a little faster.</li>
<li>Added new tests for <b>sqlite_complete()</b> and for memory leaks.</li>
</ul></p><a name="version_1_0_16"></a>
<h3>2000 Dec 4 (1.0.16)</h3><p><ul>
<li>Documentation updates.  Mostly fixing of typos and spelling errors.</li>
</ul></p><a name="version_1_0_15"></a>
<h3>2000 Oct 23 (1.0.15)</h3><p><ul>
<li>Documentation updates</li>
<li>Some sanity checking code was removed from the inner loop of vdbe.c
    to help the library to run a little faster.  The code is only
    removed if you compile with -DNDEBUG.</li>
</ul></p><a name="version_1_0_14"></a>
<h3>2000 Oct 19 (1.0.14)</h3><p><ul>
<li>Added a "memory:" backend driver that stores its database in an
    in-memory hash table.</li>
</ul></p><a name="version_1_0_13"></a>
<h3>2000 Oct 18 (1.0.13)</h3><p><ul>
<li>Break out the GDBM driver into a separate file in anticipation
    to added new drivers.</li>
<li>Allow the name of a database to be prefixed by the driver type.
    For now, the only driver type is "gdbm:".</li>
</ul></p><a name="version_1_0_12"></a>
<h3>2000 Oct 16 (1.0.12)</h3><p><ul>
<li>Fixed an off-by-one error that was causing a coredump in 
    the '%q' format directive of the new
    <b>sqlite_..._printf()</b> routines.</li>
<li>Added the <b>sqlite_interrupt()</b> interface.</li>
<li>In the shell, <b>sqlite_interrupt()</b> is invoked when the
    user presses Control-C</li>
<li>Fixed some instances where <b>sqlite_exec()</b> was
    returning the wrong error code.</li>
</ul></p><a name="version_1_0_10"></a>
<h3>2000 Oct 11 (1.0.10)</h3><p><ul>
<li>Added notes on how to compile for Windows95/98.</li>
<li>Removed a few variables that were not being used.  Etc.</li>
</ul></p><a name="version_1_0_9"></a>
<h3>2000 Oct 8 (1.0.9)</h3><p><ul>
<li>Added the <b>sqlite_..._printf()</b> interface routines.</li>
<li>Modified the <b>sqlite</b> shell program to use the new interface 
    routines.</li>
<li>Modified the <b>sqlite</b> shell program to print the schema for
    the built-in SQLITE_MASTER table, if explicitly requested.</li>
</ul></p><a name="version_1_0_8"></a>
<h3>2000 Sep 30 (1.0.8)</h3><p><ul>
<li>Begin writing documentation on the TCL interface.</li>
</ul></p><h3>2000 Sep 29 (Not Released)</h3><p><ul>
<li>Added the <b>sqlite_get_table()</b> API</li>
<li>Updated the documentation for due to the above change.</li>
<li>Modified the <b>sqlite</b> shell to make use of the new
    sqlite_get_table() API in order to print a list of tables
    in multiple columns, similar to the way "ls" prints filenames.</li>
<li>Modified the <b>sqlite</b> shell to print a semicolon at the
    end of each CREATE statement in the output of the ".schema" command.</li>
</ul></p><h3>2000 Sep 21 (Not Released)</h3><p><ul>
<li>Change the tclsqlite "eval" method to return a list of results if
    no callback script is specified.</li>
<li>Change tclsqlite.c to use the Tcl_Obj interface</li>
<li>Add tclsqlite.c to the libsqlite.a library</li>
</ul></p><h3>2000 Sep 13 (Version 1.0.5)</h3><p><ul>
<li>Changed the print format for floating point values from "%g" to "%.15g".
    </li>
<li>Changed the comparison function so that numbers in exponential notation
    (ex: 1.234e+05) sort in numerical order.</li>
</ul></p><h3>2000 Aug 28 (Version 1.0.4)</h3><p><ul>
<li>Added functions <b>length()</b> and <b>substr()</b>.</li>
<li>Fix a bug in the <b>sqlite</b> shell program that was causing
    a coredump when the output mode was "column" and the first row
    of data contained a NULL.</li>
</ul></p><h3>2000 Aug 22 (Version 1.0.3)</h3><p><ul>
<li>In the sqlite shell, print the "Database opened READ ONLY" message
    to stderr instead of stdout.</li>
<li>In the sqlite shell, now print the version number on initial startup.</li>
<li>Add the <b>sqlite_version&#91;&#93;</b> string constant to the library</li>
<li>Makefile updates</li>
<li>Bug fix: incorrect VDBE code was being generated for the following
    circumstance: a query on an indexed table containing a WHERE clause with
    an IN operator that had a subquery on its right-hand side.</li>
</ul></p><h3>2000 Aug 18 (Version 1.0.1)</h3><p><ul>
<li>Fix a bug in the configure script.</li>
<li>Minor revisions to the website.</li>
</ul></p><h3>2000 Aug 17 (Version 1.0)</h3><p><ul>
<li>Change the <b>sqlite</b> program so that it can read
    databases for which it lacks write permission.  (It used to
    refuse all access if it could not write.)</li>
</ul></p><h3>2000 Aug 9</h3><p><ul>
<li>Treat carriage returns as white space.</li>
</ul></p><h3>2000 Aug 8</h3><p><ul>
<li>Added pattern matching to the ".table" command in the "sqlite"
command shell.</li>
</ul></p><h3>2000 Aug 4</h3><p><ul>
<li>Documentation updates</li>
<li>Added "busy" and "timeout" methods to the Tcl interface</li>
</ul></p><h3>2000 Aug 3</h3><p><ul>
<li>File format version number was being stored in sqlite_master.tcl
    multiple times. This was harmless, but unnecessary. It is now fixed.</li>
</ul></p><h3>2000 Aug 2</h3><p><ul>
<li>The file format for indices was changed slightly in order to work
    around an inefficiency that can sometimes come up with GDBM when
    there are large indices having many entries with the same key.
    <font color="red">** Incompatible Change **</font></li>
</ul></p><h3>2000 Aug 1</h3><p><ul>
<li>The parser's stack was overflowing on a very long UPDATE statement.
    This is now fixed.</li>
</ul></p><h3>2000 July 31</h3><p><ul>
<li>Finish the <a href="vdbe.html">VDBE tutorial</a>.</li>
<li>Added documentation on compiling to WinNT.</li>
<li>Fix a configuration program for WinNT.</li>
<li>Fix a configuration problem for HPUX.</li>
</ul></p><h3>2000 July 29</h3><p><ul>
<li>Better labels on column names of the result.</li>
</ul></p><h3>2000 July 28</h3><p><ul>
<li>Added the <b>sqlite_busy_handler()</b> 
    and <b>sqlite_busy_timeout()</b> interface.</li>
</ul></p><h3>2000 June 23</h3><p><ul>
<li>Begin writing the <a href="vdbe.html">VDBE tutorial</a>.</li>
</ul></p><h3>2000 June 21</h3><p><ul>
<li>Clean up comments and variable names.  Changes to documentation.
    No functional changes to the code.</li>
</ul></p><h3>2000 June 19</h3><p><ul>
<li>Column names in UPDATE statements were case sensitive.
    This mistake has now been fixed.</li>
</ul></p><h3>2000 June 16</h3><p><ul>
<li>Added the concatenate string operator (||)</li>
</ul></p><h3>2000 June 12</h3><p><ul>
<li>Added the fcnt() function to the SQL interpreter.  The fcnt() function
    returns the number of database "Fetch" operations that have occurred.
    This function is designed for use in test scripts to verify that
    queries are efficient and appropriately optimized.  Fcnt() has no other
    useful purpose, as far as I know.</li>
<li>Added a bunch more tests that take advantage of the new fcnt() function.
    The new tests did not uncover any new problems.</li>
</ul></p><h3>2000 June 8</h3><p><ul>
<li>Added lots of new test cases</li>
<li>Fix a few bugs discovered while adding test cases</li>
<li>Begin adding lots of new documentation</li>
</ul></p><h3>2000 June 6</h3><p><ul>
<li>Added compound select operators: <B>UNION</b>, <b>UNION ALL</B>,
<b>INTERSECT</b>, and <b>EXCEPT</b></li>
<li>Added support for using <b>(SELECT ...)</b> within expressions</li>
<li>Added support for <b>IN</b> and <b>BETWEEN</b> operators</li>
<li>Added support for <b>GROUP BY</b> and <b>HAVING</b></li>
<li>NULL values are now reported to the callback as a NULL pointer
    rather than an empty string.</li>
</ul></p><h3>2000 June 3</h3><p><ul>
<li>Added support for default values on columns of a table.</li>
<li>Improved test coverage.  Fixed a few obscure bugs found by the
improved tests.</li>
</ul></p><h3>2000 June 2</h3><p><ul>
<li>All database files to be modified by an UPDATE, INSERT or DELETE are 
now locked before any changes are made to any files.  
This makes it safe (I think) to access
the same database simultaneously from multiple processes.</li>
<li>The code appears stable so we are now calling it "beta".</li>
</ul></p><h3>2000 June 1</h3><p><ul>
<li>Better support for file locking so that two or more processes 
(or threads)
can access the same database simultaneously.  More work needed in
this area, though.</li>
</ul></p><h3>2000 May 31</h3><p><ul>
<li>Added support for aggregate functions (Ex: <b>COUNT(*)</b>, <b>MIN(...)</b>)
to the SELECT statement.</li>
<li>Added support for <B>SELECT DISTINCT ...</B></li>
</ul></p><h3>2000 May 30</h3><p><ul>
<li>Added the <b>LIKE</b> operator.</li>
<li>Added a <b>GLOB</b> operator: similar to <B>LIKE</B> 
but it uses Unix shell globbing wildcards instead of the '%' 
and '_' wildcards of SQL.</li>
<li>Added the <B>COPY</b> command patterned after 
<a href="http://www.postgresql.org/">PostgreSQL</a> so that SQLite
can now read the output of the <b>pg_dump</b> database dump utility
of PostgreSQL.</li>
<li>Added a <B>VACUUM</B> command that calls the 
<b>gdbm_reorganize()</b> function on the underlying database
files.</li>
<li>And many, many bug fixes...</li>
</ul></p><h3>2000 May 29</h3><p><ul>
<li>Initial Public Release of Alpha code</li>
</ul></p>
</dl>

